commit a817cec5f525f85c0cda2bed5c5ec19fe978a07b
Author: Peter Cottle <petermcottle@gmail.com>
Date:   Mon Aug 13 12:40:14 2012 -0700

    in the beginning

diff --git a/arbor_src/dev.js b/arbor_src/dev.js
new file mode 100644
index 00000000..0316640e
--- /dev/null
+++ b/arbor_src/dev.js
@@ -0,0 +1,56 @@
+//
+// dev.js
+//
+// module wrapper for running from the un-minified src files
+//
+//
+// to run from src, make sure your html includes look like:
+//   <script src="js/src/etc.js"></script>
+//   <script src="js/src/kernel.js"></script>
+//   <script src="js/src/graphics/colors.js"></script>
+//   <script src="js/src/graphics/primitives.js"></script>
+//   <script src="js/src/graphics/graphics.js"></script>
+//   <script src="js/src/tween/easing.js"></script>
+//   <script src="js/src/tween/tween.js"></script>
+//   <script src="js/src/physics/atoms.js"></script>
+//   <script src="js/src/physics/barnes-hut.js"></script>
+//   <script src="js/src/physics/physics.js"></script>
+//   <script src="js/src/physics/system.js"></script>
+//   <script src="js/src/dev.js"></script>
+
+
+(function(){
+
+  arbor = (typeof(arbor)!=='undefined') ? arbor : {}
+  $.extend(arbor, {
+    // object constructors (don't use ‘new’, just call them)
+    ParticleSystem:ParticleSystem,
+    Tween:Tween,
+    Point:function(x, y){ return new Point(x, y) },
+    Graphics:function(canvas){ return Graphics(canvas) },
+
+    // immutable objects with useful methods
+    colors:{
+      CSS:Colors.CSS,           // {colorname:#fef2e2,...}
+      validate:Colors.validate, // ƒ(str) -> t/f
+      decode:Colors.decode,     // ƒ(hexString_or_cssColor) -> {r,g,b,a}
+      encode:Colors.encode,     // ƒ({r,g,b,a}) -> hexOrRgbaString
+      blend:Colors.blend        // ƒ(color, opacity) -> rgbaString
+    },
+    etc:{      
+      trace:trace,              // ƒ(msg) -> safe console logging
+      dirname:dirname,          // ƒ(path) -> leading part of path
+      basename:basename,        // ƒ(path) -> trailing part of path
+      ordinalize:ordinalize,    // ƒ(num) -> abbrev integers (and add commas)
+      objcopy:objcopy,          // ƒ(old) -> clone an object
+      objcmp:objcmp,            // ƒ(a, b, strict_ordering) -> t/f comparison
+      objkeys:objkeys,          // ƒ(obj) -> array of all keys in obj
+      objmerge:objmerge,        // ƒ(dst, src) -> like $.extend but non-destructive
+      uniq:uniq,                // ƒ(arr) -> array of unique items in arr
+      arbor_path:arbor_path,    // ƒ() -> guess the directory of the lib code
+    }
+  })
+
+  
+})()
+
diff --git a/arbor_src/etc.js b/arbor_src/etc.js
new file mode 100644
index 00000000..2d6815cd
--- /dev/null
+++ b/arbor_src/etc.js
@@ -0,0 +1,160 @@
+//
+// etc.js
+//
+// misc utilities
+//
+
+  var trace = function(msg){
+    if (typeof(window)=='undefined' || !window.console) return
+    var len = arguments.length
+    var args = []
+    for (var i=0; i<len; i++) args.push("arguments["+i+"]")
+    eval("console.log("+args.join(",")+")")
+  }  
+
+  var dirname = function(path){
+    var pth = path.replace(/^\/?(.*?)\/?$/,"$1").split('/')
+    pth.pop()
+    return "/"+pth.join("/")
+  }
+  var basename = function(path){
+    // var pth = path.replace(/^\//,'').split('/')
+    var pth = path.replace(/^\/?(.*?)\/?$/,"$1").split('/')
+    
+    var base = pth.pop()
+    if (base=="") return null
+    else return base
+  }
+
+  var _ordinalize_re = /(\d)(?=(\d\d\d)+(?!\d))/g
+  var ordinalize = function(num){
+    var norm = ""+num
+    if (num < 11000){
+      norm = (""+num).replace(_ordinalize_re, "$1,")
+    } else if (num < 1000000){
+      norm = Math.floor(num/1000)+"k"
+    } else if (num < 1000000000){
+      norm = (""+Math.floor(num/1000)).replace(_ordinalize_re, "$1,")+"m"
+    }
+    return norm
+  }
+
+  /* Nano Templates (Tomasz Mazur, Jacek Becela) */
+  var nano = function(template, data){
+    return template.replace(/\{([\w\-\.]*)}/g, function(str, key){
+      var keys = key.split("."), value = data[keys.shift()]
+      $.each(keys, function(){ 
+        if (value.hasOwnProperty(this)) value = value[this] 
+        else value = str
+      })
+      return value
+    })
+  }
+  
+  var objcopy = function(old){
+    if (old===undefined) return undefined
+    if (old===null) return null
+    
+    if (old.parentNode) return old
+    switch (typeof old){
+      case "string":
+      return old.substring(0)
+      break
+      
+      case "number":
+      return old + 0
+      break
+      
+      case "boolean":
+      return old === true
+      break
+    }
+
+    var newObj = ($.isArray(old)) ? [] : {}
+    $.each(old, function(ik, v){
+      newObj[ik] = objcopy(v)
+    })
+    return newObj
+  }
+  
+  var objmerge = function(dst, src){
+    dst = dst || {}
+    src = src || {}
+    var merge = objcopy(dst)
+    for (var k in src) merge[k] = src[k]
+    return merge
+  }
+  
+  var objcmp = function(a, b, strict_ordering){
+    if (!a || !b) return a===b // handle null+undef
+    if (typeof a != typeof b) return false // handle type mismatch
+    if (typeof a != 'object'){
+      // an atomic type
+      return a===b
+    }else{
+      // a collection type
+      
+      // first compare buckets
+      if ($.isArray(a)){
+        if (!($.isArray(b))) return false
+        if (a.length != b.length) return false
+      }else{
+        var a_keys = []; for (var k in a) if (a.hasOwnProperty(k)) a_keys.push(k)
+        var b_keys = []; for (var k in b) if (b.hasOwnProperty(k)) b_keys.push(k)
+        if (!strict_ordering){
+          a_keys.sort()
+          b_keys.sort()
+        }
+        if (a_keys.join(',') !== b_keys.join(',')) return false
+      }
+      
+      // then compare contents
+      var same = true
+      $.each(a, function(ik){
+        var diff = objcmp(a[ik], b[ik])
+        same = same && diff
+        if (!same) return false
+      })
+      return same
+    }
+  }
+
+  var objkeys = function(obj){
+    var keys = []
+    $.each(obj, function(k,v){ if (obj.hasOwnProperty(k)) keys.push(k) })
+    return keys
+  }
+  
+  var objcontains = function(obj){
+    if (!obj || typeof obj!='object') return false
+    for (var i=1, j=arguments.length; i<j; i++){
+      if (obj.hasOwnProperty(arguments[i])) return true
+    }
+    return false
+  }
+
+  var uniq = function(arr){
+    // keep in mind that this is only sensible with a list of strings
+    // anything else, objkey type coercion will turn it into one anyway
+    var len = arr.length
+    var set = {}
+    for (var i=0; i<len; i++){
+      set[arr[i]] = true
+    }
+
+    return objkeys(set) 
+  }
+
+  var arbor_path = function(){
+    var candidates = $("script").map(function(elt){
+      var src = $(this).attr('src')
+      if (!src) return
+      if (src.match(/arbor[^\/\.]*.js|dev.js/)){
+        return src.match(/.*\//) || "/"
+      }
+    })
+
+    if (candidates.length>0) return candidates[0] 
+    else return null
+  }
+  
\ No newline at end of file
diff --git a/arbor_src/graphics/colors.js b/arbor_src/graphics/colors.js
new file mode 100644
index 00000000..5ec21c32
--- /dev/null
+++ b/arbor_src/graphics/colors.js
@@ -0,0 +1,156 @@
+var Colors = (function(){
+  var iscolor_re = /#[0-9a-f]{6}/i
+  var hexrgb_re = /#(..)(..)(..)/
+
+  var d2h = function(d){
+    // decimal to hex
+    var s=d.toString(16); 
+    return (s.length==2) ? s : '0'+s
+  }
+  
+  var h2d = function(h){
+    // hex to decimal
+    return parseInt(h,16);
+  }
+
+  var _isRGB = function(color){
+    if (!color || typeof color!='object') return false
+    var components = objkeys(color).sort().join("")
+    if (components == 'abgr') return true
+  }
+
+  // var _isHSB = function(color){
+  //   if (!color || typeof cssOrHex!='object') return false
+  //   var components = objkeys(color).sort().join("")
+  //   if (components == 'hsb') return true
+  // }
+
+
+  var that = {
+    CSS:{aliceblue:"#f0f8ff", antiquewhite:"#faebd7", aqua:"#00ffff", aquamarine:"#7fffd4", azure:"#f0ffff", beige:"#f5f5dc", bisque:"#ffe4c4", black:"#000000", blanchedalmond:"#ffebcd", blue:"#0000ff", blueviolet:"#8a2be2", brown:"#a52a2a", burlywood:"#deb887", cadetblue:"#5f9ea0", chartreuse:"#7fff00", chocolate:"#d2691e", coral:"#ff7f50", cornflowerblue:"#6495ed", cornsilk:"#fff8dc", crimson:"#dc143c", cyan:"#00ffff", darkblue:"#00008b", darkcyan:"#008b8b", darkgoldenrod:"#b8860b", darkgray:"#a9a9a9", darkgrey:"#a9a9a9", darkgreen:"#006400", darkkhaki:"#bdb76b", darkmagenta:"#8b008b", darkolivegreen:"#556b2f", darkorange:"#ff8c00", darkorchid:"#9932cc", darkred:"#8b0000", darksalmon:"#e9967a", darkseagreen:"#8fbc8f", darkslateblue:"#483d8b", darkslategray:"#2f4f4f", darkslategrey:"#2f4f4f", darkturquoise:"#00ced1", darkviolet:"#9400d3", deeppink:"#ff1493", deepskyblue:"#00bfff", dimgray:"#696969", dimgrey:"#696969", dodgerblue:"#1e90ff", firebrick:"#b22222", floralwhite:"#fffaf0", forestgreen:"#228b22", fuchsia:"#ff00ff", gainsboro:"#dcdcdc", ghostwhite:"#f8f8ff", gold:"#ffd700", goldenrod:"#daa520", gray:"#808080", grey:"#808080", green:"#008000", greenyellow:"#adff2f", honeydew:"#f0fff0", hotpink:"#ff69b4", indianred:"#cd5c5c", indigo:"#4b0082", ivory:"#fffff0", khaki:"#f0e68c", lavender:"#e6e6fa", lavenderblush:"#fff0f5", lawngreen:"#7cfc00", lemonchiffon:"#fffacd", lightblue:"#add8e6", lightcoral:"#f08080", lightcyan:"#e0ffff", lightgoldenrodyellow:"#fafad2", lightgray:"#d3d3d3", lightgrey:"#d3d3d3", lightgreen:"#90ee90", lightpink:"#ffb6c1", lightsalmon:"#ffa07a", lightseagreen:"#20b2aa", lightskyblue:"#87cefa", lightslategray:"#778899", lightslategrey:"#778899", lightsteelblue:"#b0c4de", lightyellow:"#ffffe0", lime:"#00ff00", limegreen:"#32cd32", linen:"#faf0e6", magenta:"#ff00ff", maroon:"#800000", mediumaquamarine:"#66cdaa", mediumblue:"#0000cd", mediumorchid:"#ba55d3", mediumpurple:"#9370d8", mediumseagreen:"#3cb371", mediumslateblue:"#7b68ee", mediumspringgreen:"#00fa9a", mediumturquoise:"#48d1cc", mediumvioletred:"#c71585", midnightblue:"#191970", mintcream:"#f5fffa", mistyrose:"#ffe4e1", moccasin:"#ffe4b5", navajowhite:"#ffdead", navy:"#000080", oldlace:"#fdf5e6", olive:"#808000", olivedrab:"#6b8e23", orange:"#ffa500", orangered:"#ff4500", orchid:"#da70d6", palegoldenrod:"#eee8aa", palegreen:"#98fb98", paleturquoise:"#afeeee", palevioletred:"#d87093", papayawhip:"#ffefd5", peachpuff:"#ffdab9", peru:"#cd853f", pink:"#ffc0cb", plum:"#dda0dd", powderblue:"#b0e0e6", purple:"#800080", red:"#ff0000", rosybrown:"#bc8f8f", royalblue:"#4169e1", saddlebrown:"#8b4513", salmon:"#fa8072", sandybrown:"#f4a460", seagreen:"#2e8b57", seashell:"#fff5ee", sienna:"#a0522d", silver:"#c0c0c0", skyblue:"#87ceeb", slateblue:"#6a5acd", slategray:"#708090", slategrey:"#708090", snow:"#fffafa", springgreen:"#00ff7f", steelblue:"#4682b4", tan:"#d2b48c", teal:"#008080", thistle:"#d8bfd8", tomato:"#ff6347", turquoise:"#40e0d0", violet:"#ee82ee", wheat:"#f5deb3", white:"#ffffff", whitesmoke:"#f5f5f5", yellow:"#ffff00", yellowgreen:"#9acd32"},
+
+    // possible invocations:
+    //    decode(1,2,3,.4)      -> {r:1,   g:2,   b:3,   a:0.4}
+    //    decode(128, .7)       -> {r:128, g:128, b:128, a:0.7}    
+    //    decode("#ff0000")     -> {r:255, g:0,   b:0,   a:1}
+    //    decode("#ff0000",.5)  -> {r:255, g:0,   b:0,   a:0.5}
+    //    decode("white")       -> {r:255, g:255, b:255, a:1}
+    //    decode({r:0,g:0,b:0}) -> {r:0,   g:0,   b:0,   a:1}
+    decode:function(clr){
+      var argLen = arguments.length
+      for (var i=argLen-1; i>=0; i--) if (arguments[i]===undefined) argLen--
+      var args = arguments
+      if (!clr) return null
+      if (argLen==1 && _isRGB(clr)) return clr
+
+      var rgb = null
+
+      if (typeof clr=='string'){
+        var alpha = 1
+        if (argLen==2) alpha = args[1]
+        
+        var nameMatch = that.CSS[clr.toLowerCase()]
+        if (nameMatch!==undefined){
+           clr = nameMatch
+        }
+        var hexMatch = clr.match(iscolor_re)
+        if (hexMatch){
+          vals = clr.match(hexrgb_re)
+          // trace(vals)
+          if (!vals || !vals.length || vals.length!=4) return null    
+          rgb = {r:h2d(vals[1]), g:h2d(vals[2]), b:h2d(vals[3]), a:alpha}
+        }
+      }else if (typeof clr=='number'){
+        if (argLen>=3){
+          rgb = {r:args[0], g:args[1], b:args[2], a:1}
+          if (argLen>=4) rgb.a *= args[3]
+        }else if(argLen>=1){
+          rgb = {r:args[0], g:args[0], b:args[0], a:1}
+          if (argLen==2) rgb.a *= args[1]
+        }
+      }
+
+
+      // if (!rgb) trace("<null color>")
+      // else trace(nano("<r:{r} g:{g} b:{b} a:{a}>",rgb))
+      // 
+      // if (arguments.length==1){        
+      //   if (_isRGB(clr)) return clr
+      //   if (!clr || typeof clr!='string') return null
+      // 
+      //   var nameMatch = that.CSS[clr.toLowerCase()]
+      //   if (nameMatch!==undefined){
+      //      clr = nameMatch
+      //   }
+      //   var hexMatch = clr.match(iscolor_re)
+      //   if (hexMatch){
+      //     vals = clr.match(hexrgb_re)
+      //     if (!vals || !vals.length || vals.length!=4) return null    
+      //     var rgb = {r:h2d(vals[1]), g:h2d(vals[2]), b:h2d(vals[3])}
+      //     return rgb
+      //   }
+      // }
+      
+      return rgb
+    },
+    validate:function(str){
+      if (!str || typeof str!='string') return false
+      
+      if (that.CSS[str.toLowerCase()] !== undefined) return true
+      if (str.match(iscolor_re)) return true
+      return false
+    },
+    
+    // transform
+    mix:function(color1, color2, proportion){
+      var c1 = that.decode(color1)
+      var c2 = that.decode(color2)
+      
+      // var mixed = ... should this be a triplet or a string?
+    },
+    blend:function(rgbOrHex, alpha){
+      alpha = (alpha!==undefined) ? Math.max(0,Math.min(1,alpha)) : 1
+      
+      var rgb = that.decode(rgbOrHex)
+      if (!rgb) return null
+      
+      if (alpha==1) return rgbOrHex
+      var rgb = rgbOrHex
+      if (typeof rgbOrHex=='string') rgb = that.decode(rgbOrHex)
+      
+      var blended = objcopy(rgb)
+      blended.a *= alpha
+      
+      return nano("rgba({r},{g},{b},{a})", blended)
+    },
+    
+    // output
+    encode:function(rgb){
+      if (!_isRGB(rgb)){
+        rgb = that.decode(rgb)
+        if (!_isRGB(rgb)) return null
+      }
+      if (rgb.a==1){
+        return nano("#{r}{g}{b}", {r:d2h(rgb.r), g:d2h(rgb.g), b:d2h(rgb.b)} )        
+      }else{
+        return nano("rgba({r},{g},{b},{a})", rgb)
+      }
+
+      // encoding = encoding || "hex"
+      // if (!_isRGB(rgb)) return null
+      // switch(encoding){
+      // case "hex":
+      //   return nano("#{r}{g}{b}", {r:d2h(rgb.r), g:d2h(rgb.g), b:d2h(rgb.b)} )
+      //   break
+      //   
+      // case "rgba":
+      //   return nano("rgba({r},{g},{b},{alpha})", rgb)
+      //   break
+      // }
+      // // if (rgb===undefined || !rgb.length || rgb.length!=3) return null
+      // // return '#'+$.map(rgb, function(c){return d2h(c)}).join("")
+    }
+  }
+  
+  return that
+})()
diff --git a/arbor_src/graphics/graphics.js b/arbor_src/graphics/graphics.js
new file mode 100644
index 00000000..285b0568
--- /dev/null
+++ b/arbor_src/graphics/graphics.js
@@ -0,0 +1,384 @@
+//
+//  graphics.js
+//
+//  Created by Christian Swinehart on 2010-12-07.
+//  Copyright (c) 2011 Samizdat Drafting Co. All rights reserved.
+//
+
+var Graphics = function(canvas){
+  var dom = $(canvas)
+  var ctx = $(dom).get(0).getContext('2d')
+
+  var _bounds = null
+
+  var _colorMode = "rgb" // vs hsb
+  var _coordMode = "origin" // vs "center"
+
+  var _drawLibrary = {}
+  var _drawStyle = {background:null, 
+                    fill:null, 
+                    stroke:null,
+                    width:0}
+
+  var _fontLibrary = {}
+  var _fontStyle = {font:"sans-serif",
+                   size:12, 
+                   align:"left",
+                   color:Colors.decode("black"),
+                   alpha:1,
+                   baseline:"ideographic"}
+
+  var _lineBuffer = [] // calls to .lines sit here until flushed by .drawlines
+  
+  ///MACRO:primitives-start
+  var primitives = Primitives(ctx, _drawStyle, _fontStyle)
+  var _Oval = primitives._Oval
+  var _Rect = primitives._Rect
+  var _Color = primitives._Color
+  var _Path = primitives._Path
+  ///MACRO:primitives-end    
+
+
+  // drawStyle({background:"color" or {r,g,b,a}, 
+  //            fill:"color" or {r,g,b,a}, 
+  //            stroke:"color" or {r,g,b,a}, 
+  //            alpha:<number>, 
+  //            weight:<number>})
+
+
+
+
+  
+  var that = {
+    init:function(){
+      if (!ctx) return null
+      return that
+    },
+
+    // canvas-wide settings
+    size:function(width,height){
+      if (!isNaN(width) && !isNaN(height)){
+        dom.attr({width:width,height:height})
+        
+        // if (_drawStyle.fill!==null) that.fill(_drawStyle.fill)
+        // if (_drawStyle.stroke!==null) that.stroke(_drawStyle.stroke)
+        // that.textStyle(_fontStyle)
+        
+        // trace(_drawStyle,_fontStyle)
+      }
+      return {width:dom.attr('width'), height:dom.attr('height')}
+    },
+
+    clear:function(x,y,w,h){
+      if (arguments.length<4){
+        x=0; y=0
+        w=dom.attr('width')
+        h=dom.attr('height')
+      }
+      
+      ctx.clearRect(x,y,w,h)
+      if (_drawStyle.background!==null){
+        ctx.save()
+        ctx.fillStyle = Colors.encode(_drawStyle.background)
+        ctx.fillRect(x,y,w,h)
+        ctx.restore()
+      }
+    },
+
+    background:function(a,b,c,d){
+      if (a==null){
+        _drawStyle.background = null
+        return null
+      }
+      
+      var fillColor = Colors.decode(a,b,c,d)
+      if (fillColor){
+        _drawStyle.background = fillColor
+        that.clear()
+      }
+    },
+
+
+    // drawing to screen
+    noFill:function(){
+      _drawStyle.fill = null
+    },
+    fill:function(a,b,c,d){
+      if (arguments.length==0){
+        return _drawStyle.fill
+      }else if (arguments.length>0){
+        var fillColor = Colors.decode(a,b,c,d)
+        _drawStyle.fill = fillColor
+        ctx.fillStyle = Colors.encode(fillColor)
+      }
+    },
+    
+    noStroke:function(){
+      _drawStyle.stroke = null
+      ctx.strokeStyle = null
+    },
+    stroke:function(a,b,c,d){
+      if (arguments.length==0 && _drawStyle.stroke!==null){
+        return _drawStyle.stroke
+      }else if (arguments.length>0){
+        var strokeColor = Colors.decode(a,b,c,d)
+        _drawStyle.stroke = strokeColor
+        ctx.strokeStyle = Colors.encode(strokeColor)
+      }
+    },
+    strokeWidth:function(ptsize){
+      if (ptsize===undefined) return ctx.lineWidth
+      ctx.lineWidth = _drawStyle.width = ptsize
+    },
+    
+    
+    
+    Color:function(clr){
+      return new _Color(clr)
+    },
+
+
+    // Font:function(fontName, pointSize){
+    //   return new _Font(fontName, pointSize)
+    // },
+    // font:function(fontName, pointSize){
+    //   if (fontName!==undefined) _fontStyle.font = fontName
+    //   if (pointSize!==undefined) _fontStyle.size = pointSize
+    //   ctx.font = nano("{size}px {font}", _fontStyle)
+    // },
+
+
+    drawStyle:function(style){
+      // without arguments, show the current state
+      if (arguments.length==0) return objcopy(_drawStyle)
+      
+      // if this is a ("stylename", {style}) invocation, don't change the current
+      // state but add it to the library
+      if (arguments.length==2){
+        var styleName = arguments[0]
+        var styleDef = arguments[1]
+        if (typeof styleName=='string' && typeof styleDef=='object'){
+          var newStyle = {}
+          if (styleDef.color!==undefined){
+            var textColor = Colors.decode(styleDef.color)
+            if (textColor) newStyle.color = textColor
+          }
+          $.each('background fill stroke width'.split(' '), function(i, param){
+            if (styleDef[param]!==undefined) newStyle[param] = styleDef[param]
+          })
+          if (!$.isEmptyObject(newStyle)) _drawLibrary[styleName] = newStyle
+        }
+        return
+      }
+      
+      // if a ("stylename") invocation, load up the selected style
+      if (arguments.length==1 && _drawLibrary[arguments[0]]!==undefined){
+        style = _drawLibrary[arguments[0]]
+      }
+            
+      // for each of the properties specified, update the canvas state
+      if (style.width!==undefined) _drawStyle.width = style.width
+      ctx.lineWidth = _drawStyle.width
+      
+      $.each('background fill stroke',function(i, color){
+        if (style[color]!==undefined){
+          if (style[color]===null) _drawStyle[color] = null
+          else{
+            var useColor = Colors.decode(style[color])
+            if (useColor) _drawStyle[color] = useColor
+          }
+        }
+      })
+      ctx.fillStyle = _drawStyle.fill
+      ctx.strokeStyle = _drawStyle.stroke
+    },
+
+    textStyle:function(style){
+      // without arguments, show the current state
+      if (arguments.length==0) return objcopy(_fontStyle)
+      
+      // if this is a ("name", {style}) invocation, don't change the current
+      // state but add it to the library
+      if (arguments.length==2){
+        var styleName = arguments[0]
+        var styleDef = arguments[1]
+        if (typeof styleName=='string' && typeof styleDef=='object'){
+          var newStyle = {}
+          if (styleDef.color!==undefined){
+            var textColor = Colors.decode(styleDef.color)
+            if (textColor) newStyle.color = textColor
+          }
+          $.each('font size align baseline alpha'.split(' '), function(i, param){
+            if (styleDef[param]!==undefined) newStyle[param] = styleDef[param]
+          })
+          if (!$.isEmptyObject(newStyle)) _fontLibrary[styleName] = newStyle
+        }
+        return
+      }
+      
+      if (arguments.length==1 && _fontLibrary[arguments[0]]!==undefined){
+        style = _fontLibrary[arguments[0]]
+      }
+            
+      if (style.font!==undefined) _fontStyle.font = style.font
+      if (style.size!==undefined) _fontStyle.size = style.size
+      ctx.font = nano("{size}px {font}", _fontStyle)
+
+      if (style.align!==undefined){
+         ctx.textAlign = _fontStyle.align = style.align
+      }
+      if (style.baseline!==undefined){
+         ctx.textBaseline = _fontStyle.baseline = style.baseline
+      }
+
+      if (style.alpha!==undefined) _fontStyle.alpha = style.alpha
+      if (style.color!==undefined){
+        var textColor = Colors.decode(style.color)
+        if (textColor) _fontStyle.color = textColor
+      }
+      if (_fontStyle.color){
+        var textColor = Colors.blend(_fontStyle.color, _fontStyle.alpha)
+        if (textColor) ctx.fillStyle = textColor
+      }
+      // trace(_fontStyle,opts)
+    },
+
+    text:function(textStr, x, y, opts){ // opts: x,y, color, font, align, baseline, width
+      if (arguments.length>=3 && !isNaN(x)){
+        opts = opts || {}
+        opts.x = x
+        opts.y = y
+      }else if (arguments.length==2 && typeof(x)=='object'){
+        opts = x
+      }else{
+        opts = opts || {}
+      }
+
+      var style = objmerge(_fontStyle, opts)
+      ctx.save()
+        if (style.align!==undefined) ctx.textAlign = style.align
+        if (style.baseline!==undefined) ctx.textBaseline = style.baseline
+        if (style.font!==undefined && !isNaN(style.size)){
+          ctx.font = nano("{size}px {font}", style)
+        }
+
+        var alpha = (style.alpha!==undefined) ? style.alpha : _fontStyle.alpha
+        var color = (style.color!==undefined) ? style.color : _fontStyle.color
+        ctx.fillStyle = Colors.blend(color, alpha)
+        
+        // if (alpha>0) ctx.fillText(textStr, style.x, style.y);        
+        if (alpha>0) ctx.fillText(textStr, Math.round(style.x), style.y);        
+      ctx.restore()
+    },
+
+    textWidth:function(textStr, style){ // style: x,y, color, font, align, baseline, width
+      style = objmerge(_fontStyle, style||{})
+      ctx.save()
+        ctx.font = nano("{size}px {font}", style)
+        var width = ctx.measureText(textStr).width			  
+      ctx.restore()
+      return width
+    },
+    
+    // hasFont:function(fontName){
+    //   var testTxt = 'H h H a H m H b H u H r H g H e H r H f H o H n H s H t H i H v H'
+    //   ctx.save()
+    //   ctx.font = '10px sans-serif'
+    //   var defaultWidth = ctx.measureText(testTxt).width
+    // 
+    //   ctx.font = '10px "'+fontName+'"'
+    //   var putativeWidth = ctx.measureText(testTxt).width
+    //   ctx.restore()
+    //   
+    //   // var defaultWidth = that.textWidth(testTxt, {font:"Times New Roman", size:120})
+    //   // var putativeWidth = that.textWidth(testTxt, {font:fontName, size:120})
+    //   trace(defaultWidth,putativeWidth,ctx.font)
+    //   // return (putativeWidth!=defaultWidth || fontName=="Times New Roman")
+    //   return putativeWidth!=defaultWidth
+    // },
+    
+    
+    // shape primitives.
+    // classes will return an {x,y,w,h, fill(), stroke()} object without drawing
+    // functions will draw the shape based on current stroke/fill state
+    Rect:function(x,y,w,h,r,style){
+      return new _Rect(x,y,w,h,r,style)
+    },
+    rect:function(x, y, w, h, r, style){
+      _Rect.prototype._draw(x,y,w,h,r,style)
+    },
+    
+    Oval:function(x, y, w, h, style) {
+      return new _Oval(x,y,w,h, style)
+    },
+    oval:function(x, y, w, h, style) {
+      style = style || {}
+      _Oval.prototype._draw(x,y,w,h, style)
+    },
+    
+    // draw a line immediately
+    line:function(x1, y1, x2, y2, style){
+      var p = new _Path(x1,y1,x2,y2)
+      p.draw(style)
+    },
+    
+    // queue up a line segment to be drawn in a batch by .drawLines
+    lines:function(x1, y1, x2, y2){
+      if (typeof y2=='number'){
+        // ƒ( x1, y1, x2, y2)
+        _lineBuffer.push( [ {x:x1,y:y1}, {x:x2,y:y2} ] )
+      }else{
+        // ƒ( {x:1, y:1}, {x:2, y:2} )
+        _lineBuffer.push( [ x1,y1 ] )
+      }
+    },
+    
+    // flush the buffered .lines to screen
+    drawLines:function(style){
+      var p = new _Path(_lineBuffer)
+      p.draw(style)
+      _lineBuffer = []
+    }
+    
+
+  }
+  
+  return that.init()    
+}
+
+
+// // helpers for figuring out where to draw arrows
+// var intersect_line_line = function(p1, p2, p3, p4)
+// {
+//  var denom = ((p4.y - p3.y)*(p2.x - p1.x) - (p4.x - p3.x)*(p2.y - p1.y));
+// 
+//  // lines are parallel
+//  if (denom === 0) {
+//    return false;
+//  }
+// 
+//  var ua = ((p4.x - p3.x)*(p1.y - p3.y) - (p4.y - p3.y)*(p1.x - p3.x)) / denom;
+//  var ub = ((p2.x - p1.x)*(p1.y - p3.y) - (p2.y - p1.y)*(p1.x - p3.x)) / denom;
+// 
+//  if (ua < 0 || ua > 1 || ub < 0 || ub > 1) {
+//    return false;
+//  }
+// 
+//  return arbor.Point(p1.x + ua * (p2.x - p1.x), p1.y + ua * (p2.y - p1.y));
+// }
+// 
+// var intersect_line_box = function(p1, p2, p3, w, h)
+// {
+//  var tl = {x: p3.x, y: p3.y};
+//  var tr = {x: p3.x + w, y: p3.y};
+//  var bl = {x: p3.x, y: p3.y + h};
+//  var br = {x: p3.x + w, y: p3.y + h};
+// 
+//  var result;
+//  if (result = intersect_line_line(p1, p2, tl, tr)) { return result; } // top
+//  if (result = intersect_line_line(p1, p2, tr, br)) { return result; } // right
+//  if (result = intersect_line_line(p1, p2, br, bl)) { return result; } // bottom
+//  if (result = intersect_line_line(p1, p2, bl, tl)) { return result; } // left
+// 
+//  return false;
+// }
diff --git a/arbor_src/graphics/primitives.js b/arbor_src/graphics/primitives.js
new file mode 100644
index 00000000..a7afad3d
--- /dev/null
+++ b/arbor_src/graphics/primitives.js
@@ -0,0 +1,252 @@
+//
+//  primitives
+//
+//  Created by Christian Swinehart on 2010-12-08.
+//  Copyright (c) 2011 Samizdat Drafting Co. All rights reserved.
+//
+
+
+var Primitives = function(ctx, _drawStyle, _fontStyle){
+
+    ///MACRO:primitives-start
+    var _Oval = function(x,y,w,h,style){
+      this.x = x
+      this.y = y
+      this.w = w
+      this.h = h
+      this.style = (style!==undefined) ? style : {}
+    }
+    _Oval.prototype = {
+      draw:function(overrideStyle){
+        this._draw(overrideStyle)
+      },
+
+      _draw:function(x,y,w,h, style){
+        if (objcontains(x, 'stroke', 'fill', 'width')) style = x
+        if (this.x!==undefined){
+          x=this.x, y=this.y, w=this.w, h=this.h;
+          style = objmerge(this.style, style)
+        }
+        style = objmerge(_drawStyle, style)
+        if (!style.stroke && !style.fill) return
+
+        var kappa = .5522848;
+            ox = (w / 2) * kappa, // control point offset horizontal
+            oy = (h / 2) * kappa, // control point offset vertical
+            xe = x + w,           // x-end
+            ye = y + h,           // y-end
+            xm = x + w / 2,       // x-middle
+            ym = y + h / 2;       // y-middle
+
+        ctx.save()
+          ctx.beginPath();
+          ctx.moveTo(x, ym);
+          ctx.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
+          ctx.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
+          ctx.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
+          ctx.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
+          ctx.closePath();
+
+          // trace(style.fill, style.stroke)
+          if (style.fill!==null){
+            // trace("fill",fillColor, Colors.encode(fillColor))
+            if (style.alpha!==undefined) ctx.fillStyle = Colors.blend(style.fill, style.alpha)
+            else ctx.fillStyle = Colors.encode(style.fill)
+            ctx.fill()
+          }
+
+          if (style.stroke!==null){
+            ctx.strokeStyle = Colors.encode(style.stroke)
+            if (!isNaN(style.width)) ctx.lineWidth = style.width
+            ctx.stroke()
+          }      
+        ctx.restore()
+      }
+
+    }
+
+    var _Rect = function(x,y,w,h,r,style){
+      if (objcontains(r, 'stroke', 'fill', 'width')){
+         style = r
+         r = 0
+      }
+      this.x = x
+      this.y = y
+      this.w = w
+      this.h = h
+      this.r = (r!==undefined) ? r : 0
+      this.style = (style!==undefined) ? style : {}
+    }
+    _Rect.prototype = {
+      draw:function(overrideStyle){
+        this._draw(overrideStyle)
+      },
+
+      _draw:function(x,y,w,h,r, style){
+        if (objcontains(r, 'stroke', 'fill', 'width', 'alpha')){
+          style = r; r=0;
+        }else if (objcontains(x, 'stroke', 'fill', 'width', 'alpha')){
+          style = x
+        }
+        if (this.x!==undefined){
+          x=this.x, y=this.y, w=this.w, h=this.h;
+          style = objmerge(this.style, style)
+        }
+        style = objmerge(_drawStyle, style)
+        if (!style.stroke && !style.fill) return
+
+        var rounded = (r>0)
+        ctx.save()
+        ctx.beginPath();
+        ctx.moveTo(x+r, y);
+        ctx.lineTo(x+w-r, y);
+        if (rounded) ctx.quadraticCurveTo(x+w, y, x+w, y+r);
+        ctx.lineTo(x+w, y+h-r);
+        if (rounded) ctx.quadraticCurveTo(x+w, y+h, x+w-r, y+h);
+        ctx.lineTo(x+r, y+h);
+        if (rounded) ctx.quadraticCurveTo(x, y+h, x, y+h-r);
+        ctx.lineTo(x, y+r);
+        if (rounded) ctx.quadraticCurveTo(x, y, x+r, y);      
+
+
+        if (style.fill!==null){
+          if (style.alpha!==undefined) ctx.fillStyle = Colors.blend(style.fill, style.alpha)
+          else ctx.fillStyle = Colors.encode(style.fill)
+          ctx.fill()
+        }
+
+        if (style.stroke!==null){
+          ctx.strokeStyle = Colors.encode(style.stroke)
+          if (!isNaN(style.width)) ctx.lineWidth = style.width
+          ctx.stroke()
+        }      
+        ctx.restore()
+      }
+    }
+
+    var _Path = function(x1, y1, x2, y2, style){
+      // calling patterns:
+      // ƒ( x1, y1, x2, y2, <style> )
+      // ƒ( {x:1, y:1}, {x:2, y:2}, <style> )
+      // ƒ( [ {x:1, y:1}, {x:2, y:2}, ...], <style> ) one continuous line
+      // ƒ( [ [{x,y}, {x,y}], [{x,y}, {x,y}], ...], <style> ) separate lines
+
+      if (style!==undefined || typeof y2=='number'){
+        // ƒ( x1, y1, x2, y2, <style> )
+        this.points = [ {x:x1,y:y1}, {x:x2,y:y2} ]
+        this.style = style || {}
+      }else if ($.isArray(x1)){
+        // ƒ( [ {x:1, y:1}, {x:2, y:2}, ...], <style> )
+        this.points = x1
+        this.style = y1 || {}
+      }else{
+        // ƒ( {x:1, y:1}, {x:2, y:2}, <style> )
+        this.points = [ x1, y1 ]
+        this.style = x2 || {}
+      }
+    }
+    _Path.prototype = {
+      draw:function(overrideStyle){
+        if (this.points.length<2) return
+
+        var sublines = []
+        if (!$.isArray(this.points[0])) sublines.push(this.points)
+        else sublines = this.points
+        
+        ctx.save()
+          ctx.beginPath();
+          $.each(sublines, function(i, lineseg){
+            ctx.moveTo(lineseg[0].x+.5, lineseg[0].y+.5);
+            $.each(lineseg, function(i, pt){
+              if (i==0) return
+              ctx.lineTo(pt.x+.5, pt.y+.5);
+            })
+          })
+
+          var style = $.extend(objmerge(_drawStyle, this.style), overrideStyle)
+          if (style.closed) ctx.closePath()
+
+          if (style.fill!==undefined){
+            var fillColor = Colors.decode(style.fill, (style.alpha!==undefined) ? style.alpha : 1)
+            if (fillColor) ctx.fillStyle = Colors.encode(fillColor)
+              ctx.fill()
+          }
+
+          if (style.stroke!==undefined){
+            var strokeColor = Colors.decode(style.stroke, (style.alpha!==undefined) ? style.alpha : 1)
+            if (strokeColor) ctx.strokeStyle = Colors.encode(strokeColor)
+            if (!isNaN(style.width)) ctx.lineWidth = style.width
+            ctx.stroke()
+          }
+  			ctx.restore()
+      }
+    }
+    
+
+    var _Color = function(a,b,c,d){
+      var rgba = Colors.decode(a,b,c,d)
+      if (rgba){
+        this.r = rgba.r
+        this.g = rgba.g
+        this.b = rgba.b
+        this.a = rgba.a
+      }
+    }
+
+    _Color.prototype = {
+      toString:function(){
+        return Colors.encode(this)
+      },
+      blend:function(){
+        trace("blend",this.r,this.g,this.b,this.a)
+      }
+    }
+
+    // var _Font = function(face, size){
+    //   this.face = (face!=undefined) ? face : "sans-serif"
+    //   this.size = (size!=undefined) ? size : 12
+    //   // this.alignment = (opts.alignment!=undefined) ? alignment : "left"
+    //   // this.baseline = (opts.baseline!=undefined) ? baseline : "ideographic"
+    //   // this.color = (opts.color!=undefined) ? Colors.decode(opts.color) : Colors.decode("black")
+    // }
+    // _Font.prototype = {
+    //   _use:function(face, size){
+    //     // var params = $.extend({face:face, size:size}, opts)
+    //     // $.each('face size alignment baseline color'.split(" "), function(i, param){
+    //     //   if (params[param]!==undefined){
+    //     //     if (param=='color') _fontStyle[param] = Colors.decode(params[param])
+    //     //     else _fontStyle[param] = params[param]
+    //     //   }
+    //     // })
+    // 
+    //     // ctx.textAlign = _fontStyle.alignment
+    //     // ctx.textBaseline = _fontStyle.baseline
+    //     ctx.font = nano("{size}px {face}", {face:face, size:size})
+    //     // trace(ctx.font,face,size)      
+    //     // ctx.fillStyle = Colors.encode(_fontStyle)
+    //     // _fontStyle = {face:face, size:size, alignment:opts.alignment, baseline:opts.baseline, color:opts.color}
+    //   },
+    //   use:function(){
+    //     ctx.font = nano("{size}px {face}", this)
+    //   }
+    // }
+    // 
+    // 
+
+  ///MACRO:primitives-end
+
+  
+
+
+
+
+
+
+  return {
+    _Oval:_Oval,
+    _Rect:_Rect,
+    _Color:_Color,
+    _Path:_Path
+    // _Frame:Frame
+  }
+}
\ No newline at end of file
diff --git a/arbor_src/hermetic.js b/arbor_src/hermetic.js
new file mode 100644
index 00000000..c3a8835f
--- /dev/null
+++ b/arbor_src/hermetic.js
@@ -0,0 +1,48 @@
+//
+// hermetic.js
+//
+// the parts of jquery i can't live without (e.g., while in a web worker)
+//
+$ = {
+  each:function(obj, callback){
+    if ($.isArray(obj)){
+      for (var i=0, j=obj.length; i<j; i++) callback(i, obj[i])
+    }else{
+      for (var k in obj) callback(k, obj[k])
+    }
+  },
+  map:function(arr, fn){
+    var out = []
+    $.each(arr, function(i, elt){
+      var result = fn(elt)
+      if (result!==undefined) out.push(result)
+    })
+    return out
+  },
+  extend:function(dst, src){
+    if (typeof src!='object') return dst
+    
+    for (var k in src){
+      if (src.hasOwnProperty(k)) dst[k] = src[k]
+    }
+    
+    return dst
+  },
+  isArray:function(obj){
+    if (!obj) return false
+    return (obj.constructor.toString().indexOf("Array") != -1)
+  },
+
+  inArray:function(elt, arr){
+    for (var i=0, j=arr.length; i<j; i++) if (arr[i]===elt) return i;
+    return -1
+  },
+  isEmptyObject:function(obj){
+    if (typeof obj!=='object') return false
+    var isEmpty = true
+    $.each(obj, function(k, elt){
+      isEmpty = false
+    })
+    return isEmpty
+  },
+}
diff --git a/arbor_src/kernel.js b/arbor_src/kernel.js
new file mode 100644
index 00000000..ffaa682c
--- /dev/null
+++ b/arbor_src/kernel.js
@@ -0,0 +1,237 @@
+//
+// kernel.js
+//
+// run-loop manager for physics and tween updates
+//
+    
+  var Kernel = function(pSystem){
+    // in chrome, web workers aren't available to pages with file:// urls
+    var chrome_local_file = window.location.protocol == "file:" &&
+                            navigator.userAgent.toLowerCase().indexOf('chrome') > -1;
+    var USE_WORKER = (window.Worker !== undefined && !chrome_local_file)    
+    
+    var _physics = null
+    var _tween = null
+    var _fpsWindow = [] // for keeping track of the actual frame rate
+    _fpsWindow.last = new Date()
+    var _screenInterval = null
+    var _attached = null
+
+    var _tickInterval = null
+    var _lastTick = null
+    var _paused = false
+    
+    var that = {
+      system:pSystem,
+      tween:null,
+      nodes:{},
+
+      init:function(){ 
+        if (typeof(Tween)!='undefined') _tween = Tween()
+        else if (typeof(arbor.Tween)!='undefined') _tween = arbor.Tween()
+        else _tween = {busy:function(){return false},
+                       tick:function(){return true},
+                       to:function(){ trace('Please include arbor-tween.js to enable tweens'); _tween.to=function(){}; return} }
+        that.tween = _tween
+        var params = pSystem.parameters()
+                
+        if(USE_WORKER){
+          trace('arbor.js/web-workers',params)
+          _screenInterval = setInterval(that.screenUpdate, params.timeout)
+
+          _physics = new Worker(arbor_path()+'physics/worker.js')
+          _physics.onmessage = that.workerMsg
+          _physics.onerror = function(e){ trace('physics:',e) }
+          _physics.postMessage({type:"physics", 
+                                physics:objmerge(params, 
+                                                {timeout:Math.ceil(params.timeout)}) })
+        }else{
+          trace('arbor.js/single-threaded',params)
+          _physics = Physics(params.dt, params.stiffness, params.repulsion, params.friction, that.system._updateGeometry, params.integrator)
+          that.start()
+        }
+
+        return that
+      },
+
+      //
+      // updates from the ParticleSystem
+      graphChanged:function(changes){
+        // a node or edge was added or deleted
+        if (USE_WORKER) _physics.postMessage({type:"changes","changes":changes})
+        else _physics._update(changes)
+        that.start() // <- is this just to kick things off in the non-worker mode? (yes)
+      },
+
+      particleModified:function(id, mods){
+        // a particle's position or mass is changed
+        // trace('mod',objkeys(mods))
+        if (USE_WORKER) _physics.postMessage({type:"modify", id:id, mods:mods})
+        else _physics.modifyNode(id, mods)
+        that.start() // <- is this just to kick things off in the non-worker mode? (yes)
+      },
+
+      physicsModified:function(param){
+
+        // intercept changes to the framerate in case we're using a worker and
+        // managing our own draw timer
+        if (!isNaN(param.timeout)){
+          if (USE_WORKER){
+            clearInterval(_screenInterval)
+            _screenInterval = setInterval(that.screenUpdate, param.timeout)
+          }else{
+            // clear the old interval then let the call to .start set the new one
+            clearInterval(_tickInterval)
+            _tickInterval=null
+          }
+        }
+
+        // a change to the physics parameters 
+        if (USE_WORKER) _physics.postMessage({type:'sys',param:param})
+        else _physics.modifyPhysics(param)
+        that.start() // <- is this just to kick things off in the non-worker mode? (yes)
+      },
+      
+      workerMsg:function(e){
+        var type = e.data.type
+        if (type=='geometry'){
+          that.workerUpdate(e.data)
+        }else{
+          trace('physics:',e.data)
+        }
+      },
+      _lastPositions:null,
+      workerUpdate:function(data){
+        that._lastPositions = data
+        that._lastBounds = data.bounds
+      },
+      
+
+      // 
+      // the main render loop when running in web worker mode
+      _lastFrametime:new Date().valueOf(),
+      _lastBounds:null,
+      _currentRenderer:null,
+      screenUpdate:function(){        
+        var now = new Date().valueOf()
+        
+        var shouldRedraw = false
+        if (that._lastPositions!==null){
+          that.system._updateGeometry(that._lastPositions)
+          that._lastPositions = null
+          shouldRedraw = true
+        }
+        
+        if (_tween && _tween.busy()) shouldRedraw = true
+
+        if (that.system._updateBounds(that._lastBounds)) shouldRedraw=true
+        
+
+        if (shouldRedraw){
+          var render = that.system.renderer
+          if (render!==undefined){
+            if (render !== _attached){
+               render.init(that.system)
+               _attached = render
+            }          
+            
+            if (_tween) _tween.tick()
+            render.redraw()
+
+            var prevFrame = _fpsWindow.last
+            _fpsWindow.last = new Date()
+            _fpsWindow.push(_fpsWindow.last-prevFrame)
+            if (_fpsWindow.length>50) _fpsWindow.shift()
+          }
+        }
+      },
+
+      // 
+      // the main render loop when running in non-worker mode
+      physicsUpdate:function(){
+        if (_tween) _tween.tick()
+        _physics.tick()
+
+        var stillActive = that.system._updateBounds()
+        if (_tween && _tween.busy()) stillActive = true
+
+        var render = that.system.renderer
+        var now = new Date()        
+        var render = that.system.renderer
+        if (render!==undefined){
+          if (render !== _attached){
+            render.init(that.system)
+            _attached = render
+          }          
+          render.redraw({timestamp:now})
+        }
+
+        var prevFrame = _fpsWindow.last
+        _fpsWindow.last = now
+        _fpsWindow.push(_fpsWindow.last-prevFrame)
+        if (_fpsWindow.length>50) _fpsWindow.shift()
+
+        // but stop the simulation when energy of the system goes below a threshold
+        var sysEnergy = _physics.systemEnergy()
+        if ((sysEnergy.mean + sysEnergy.max)/2 < 0.05){
+          if (_lastTick===null) _lastTick=new Date().valueOf()
+          if (new Date().valueOf()-_lastTick>1000){
+            // trace('stopping')
+            clearInterval(_tickInterval)
+            _tickInterval = null
+          }else{
+            // trace('pausing')
+          }
+        }else{
+          // trace('continuing')
+          _lastTick = null
+        }
+      },
+
+
+      fps:function(newTargetFPS){
+        if (newTargetFPS!==undefined){
+          var timeout = 1000/Math.max(1,targetFps)
+          that.physicsModified({timeout:timeout})
+        }
+        
+        var totInterv = 0
+        for (var i=0, j=_fpsWindow.length; i<j; i++) totInterv+=_fpsWindow[i]
+        var meanIntev = totInterv/Math.max(1,_fpsWindow.length)
+        if (!isNaN(meanIntev)) return Math.round(1000/meanIntev)
+        else return 0
+      },
+
+      // 
+      // start/stop simulation
+      // 
+      start:function(unpause){
+      	if (_tickInterval !== null) return; // already running
+        if (_paused && !unpause) return; // we've been .stopped before, wait for unpause
+        _paused = false
+        
+        if (USE_WORKER){
+           _physics.postMessage({type:"start"})
+        }else{
+          _lastTick = null
+          _tickInterval = setInterval(that.physicsUpdate, 
+                                      that.system.parameters().timeout)
+        }
+      },
+      stop:function(){
+        _paused = true
+        if (USE_WORKER){
+           _physics.postMessage({type:"stop"})
+        }else{
+          if (_tickInterval!==null){
+            clearInterval(_tickInterval)
+            _tickInterval = null
+          }
+        }
+      
+      }
+    }
+    
+    return that.init()    
+  }
+  
\ No newline at end of file
diff --git a/arbor_src/physics/atoms.js b/arbor_src/physics/atoms.js
new file mode 100644
index 00000000..7cbff491
--- /dev/null
+++ b/arbor_src/physics/atoms.js
@@ -0,0 +1,95 @@
+//
+// atoms.js
+//
+// particle system- or physics-related datatypes
+//
+
+var Node = function(data){
+	this._id = _nextNodeId++; // simple ints to allow the Kernel & ParticleSystem to chat
+	this.data = data || {};  // the user-serviceable parts
+	this._mass = (data.mass!==undefined) ? data.mass : 1
+	this._fixed = (data.fixed===true) ? true : false
+	this._p = new Point((typeof(data.x)=='number') ? data.x : null, 
+                     (typeof(data.y)=='number') ? data.y : null)
+  delete this.data.x
+  delete this.data.y
+  delete this.data.mass
+  delete this.data.fixed
+};
+var _nextNodeId = 1
+
+var Edge = function(source, target, data){
+	this._id = _nextEdgeId--;
+	this.source = source;
+	this.target = target;
+	this.length = (data.length!==undefined) ? data.length : 1
+	this.data = (data!==undefined) ? data : {};
+	delete this.data.length
+};
+var _nextEdgeId = -1
+
+var Particle = function(position, mass){
+  this.p = position;
+  this.m = mass;
+	this.v = new Point(0, 0); // velocity
+	this.f = new Point(0, 0); // force
+};
+Particle.prototype.applyForce = function(force){
+	this.f = this.f.add(force.divide(this.m));
+};
+
+var Spring = function(point1, point2, length, k)
+{
+	this.point1 = point1; // a particle
+	this.point2 = point2; // another particle
+	this.length = length; // spring length at rest
+	this.k = k;           // stiffness
+};
+Spring.prototype.distanceToParticle = function(point)
+{
+  // see http://stackoverflow.com/questions/849211/shortest-distance-between-a-point-and-a-line-segment/865080#865080
+  var n = that.point2.p.subtract(that.point1.p).normalize().normal();
+  var ac = point.p.subtract(that.point1.p);
+  return Math.abs(ac.x * n.x + ac.y * n.y);
+};
+
+var Point = function(x, y){
+  if (x && x.hasOwnProperty('y')){
+    y = x.y; x=x.x;
+  }
+  this.x = x;
+  this.y = y;  
+}
+
+Point.random = function(radius){
+  radius = (radius!==undefined) ? radius : 5
+	return new Point(2*radius * (Math.random() - 0.5), 2*radius* (Math.random() - 0.5));
+}
+
+Point.prototype = {
+  exploded:function(){
+    return ( isNaN(this.x) || isNaN(this.y) )
+  },
+  add:function(v2){
+  	return new Point(this.x + v2.x, this.y + v2.y);
+  },
+  subtract:function(v2){
+  	return new Point(this.x - v2.x, this.y - v2.y);
+  },
+  multiply:function(n){
+  	return new Point(this.x * n, this.y * n);
+  },
+  divide:function(n){
+  	return new Point(this.x / n, this.y / n);
+  },
+  magnitude:function(){
+  	return Math.sqrt(this.x*this.x + this.y*this.y);
+  },
+  normal:function(){
+  	return new Point(-this.y, this.x);
+  },
+  normalize:function(){
+  	return this.divide(this.magnitude());
+  }
+}
+
diff --git a/arbor_src/physics/barnes-hut.js b/arbor_src/physics/barnes-hut.js
new file mode 100644
index 00000000..9d593dad
--- /dev/null
+++ b/arbor_src/physics/barnes-hut.js
@@ -0,0 +1,173 @@
+//
+//  barnes-hut.js
+//
+//  implementation of the barnes-hut quadtree algorithm for n-body repulsion
+//  http://www.cs.princeton.edu/courses/archive/fall03/cs126/assignments/barnes-hut.html
+//
+//  Created by Christian Swinehart on 2011-01-14.
+//  Copyright (c) 2011 Samizdat Drafting Co. All rights reserved.
+//
+
+  var BarnesHutTree = function(){
+    var _branches = []
+    var _branchCtr = 0
+    var _root = null
+    var _theta = .5
+    
+    var that = {
+      init:function(topleft, bottomright, theta){
+        _theta = theta
+
+        // create a fresh root node for these spatial bounds
+        _branchCtr = 0
+        _root = that._newBranch()
+        _root.origin = topleft
+        _root.size = bottomright.subtract(topleft)
+      },
+      
+      insert:function(newParticle){
+        // add a particle to the tree, starting at the current _root and working down
+        var node = _root
+        var queue = [newParticle]
+
+        while (queue.length){
+          var particle = queue.shift()
+          var p_mass = particle._m || particle.m
+          var p_quad = that._whichQuad(particle, node)
+
+          if (node[p_quad]===undefined){
+            // slot is empty, just drop this node in and update the mass/c.o.m.
+            node[p_quad] = particle
+            node.mass += p_mass
+            if (node.p){
+              node.p = node.p.add(particle.p.multiply(p_mass))
+            }else{
+              node.p = particle.p.multiply(p_mass)
+            }
+            
+          }else if ('origin' in node[p_quad]){
+            // slot conatins a branch node, keep iterating with the branch
+            // as our new root
+            node.mass += (p_mass)
+            if (node.p) node.p = node.p.add(particle.p.multiply(p_mass))
+            else node.p = particle.p.multiply(p_mass)
+            
+            node = node[p_quad]
+            queue.unshift(particle)
+          }else{
+            // slot contains a particle, create a new branch and recurse with
+            // both points in the queue now
+            var branch_size = node.size.divide(2)
+            var branch_origin = new Point(node.origin)
+            if (p_quad[0]=='s') branch_origin.y += branch_size.y
+            if (p_quad[1]=='e') branch_origin.x += branch_size.x
+
+            // replace the previously particle-occupied quad with a new internal branch node
+            var oldParticle = node[p_quad]
+            node[p_quad] = that._newBranch()
+            node[p_quad].origin = branch_origin
+            node[p_quad].size = branch_size
+            node.mass = p_mass
+            node.p = particle.p.multiply(p_mass)
+            node = node[p_quad]
+
+            if (oldParticle.p.x===particle.p.x && oldParticle.p.y===particle.p.y){
+              // prevent infinite bisection in the case where two particles
+              // have identical coordinates by jostling one of them slightly
+              var x_spread = branch_size.x*.08
+              var y_spread = branch_size.y*.08
+              oldParticle.p.x = Math.min(branch_origin.x+branch_size.x,  
+                                         Math.max(branch_origin.x,  
+                                                  oldParticle.p.x - x_spread/2 + 
+                                                  Math.random()*x_spread))
+              oldParticle.p.y = Math.min(branch_origin.y+branch_size.y,  
+                                         Math.max(branch_origin.y,  
+                                                  oldParticle.p.y - y_spread/2 + 
+                                                  Math.random()*y_spread))
+            }
+
+            // keep iterating but now having to place both the current particle and the
+            // one we just replaced with the branch node
+            queue.push(oldParticle)
+            queue.unshift(particle)
+          }
+
+        }
+
+      },
+
+      applyForces:function(particle, repulsion){
+        // find all particles/branch nodes this particle interacts with and apply
+        // the specified repulsion to the particle
+        var queue = [_root]
+        while (queue.length){
+          node = queue.shift()
+          if (node===undefined) continue
+          if (particle===node) continue
+          
+          if ('f' in node){
+            // this is a particle leafnode, so just apply the force directly
+            var d = particle.p.subtract(node.p);
+            var distance = Math.max(1.0, d.magnitude());
+            var direction = ((d.magnitude()>0) ? d : Point.random(1)).normalize()
+            particle.applyForce(direction.multiply(repulsion*(node._m||node.m))
+                                      .divide(distance * distance) );
+          }else{
+            // it's a branch node so decide if it's cluster-y and distant enough
+            // to summarize as a single point. if it's too complex, open it and deal
+            // with its quadrants in turn
+            var dist = particle.p.subtract(node.p.divide(node.mass)).magnitude()
+            var size = Math.sqrt(node.size.x * node.size.y)
+            if (size/dist > _theta){ // i.e., s/d > Θ
+              // open the quad and recurse
+              queue.push(node.ne)
+              queue.push(node.nw)
+              queue.push(node.se)
+              queue.push(node.sw)
+            }else{
+              // treat the quad as a single body
+              var d = particle.p.subtract(node.p.divide(node.mass));
+              var distance = Math.max(1.0, d.magnitude());
+              var direction = ((d.magnitude()>0) ? d : Point.random(1)).normalize()
+              particle.applyForce(direction.multiply(repulsion*(node.mass))
+                                           .divide(distance * distance) );
+            }
+          }
+        }
+      },
+      
+      _whichQuad:function(particle, node){
+        // sort the particle into one of the quadrants of this node
+        if (particle.p.exploded()) return null
+        var particle_p = particle.p.subtract(node.origin)
+        var halfsize = node.size.divide(2)
+        if (particle_p.y < halfsize.y){
+          if (particle_p.x < halfsize.x) return 'nw'
+          else return 'ne'
+        }else{
+          if (particle_p.x < halfsize.x) return 'sw'
+          else return 'se'
+        }
+      },
+      
+      _newBranch:function(){
+        // to prevent a gc horrorshow, recycle the tree nodes between iterations
+        if (_branches[_branchCtr]){
+          var branch = _branches[_branchCtr]
+          branch.ne = branch.nw = branch.se = branch.sw = undefined
+          branch.mass = 0
+          delete branch.p
+        }else{
+          branch = {origin:null, size:null, 
+                    nw:undefined, ne:undefined, sw:undefined, se:undefined, mass:0}
+          _branches[_branchCtr] = branch
+        }
+
+        _branchCtr++
+        return branch
+      }
+    }
+    
+    return that
+  }
+
diff --git a/arbor_src/physics/physics.js b/arbor_src/physics/physics.js
new file mode 100644
index 00000000..a3b2d563
--- /dev/null
+++ b/arbor_src/physics/physics.js
@@ -0,0 +1,364 @@
+//
+// physics.js
+//
+// the particle system itself. either run inline or in a worker (see worker.js)
+//
+
+  var Physics = function(dt, stiffness, repulsion, friction, updateFn, integrator){
+    var bhTree = BarnesHutTree() // for computing particle repulsion
+    var active = {particles:{}, springs:{}}
+    var free = {particles:{}}
+    var particles = []
+    var springs = []
+    var _epoch=0
+    var _energy = {sum:0, max:0, mean:0}
+    var _bounds = {topleft:new Point(-1,-1), bottomright:new Point(1,1)}
+
+    var SPEED_LIMIT = 1000 // the max particle velocity per tick
+    
+    var that = {
+      integrator:['verlet','euler'].indexOf(integrator)>=0 ? integrator : 'verlet',
+      stiffness:(stiffness!==undefined) ? stiffness : 1000,
+      repulsion:(repulsion!==undefined)? repulsion : 600,
+      friction:(friction!==undefined)? friction : .3,
+      gravity:false,
+      dt:(dt!==undefined)? dt : 0.02,
+      theta:.4, // the criterion value for the barnes-hut s/d calculation
+      
+      init:function(){
+        return that
+      },
+
+      modifyPhysics:function(param){
+        $.each(['stiffness','repulsion','friction','gravity','dt','precision', 'integrator'], function(i, p){
+          if (param[p]!==undefined){
+            if (p=='precision'){
+              that.theta = 1-param[p]
+              return
+            }
+            that[p] = param[p]
+
+            if (p=='stiffness'){
+              var stiff=param[p]
+              $.each(active.springs, function(id, spring){
+                spring.k = stiff
+              })             
+            }
+          }
+        })
+      },
+
+      addNode:function(c){
+        var id = c.id
+        var mass = c.m
+
+        var w = _bounds.bottomright.x - _bounds.topleft.x
+        var h = _bounds.bottomright.y - _bounds.topleft.y
+        var randomish_pt = new Point((c.x != null) ? c.x: _bounds.topleft.x + w*Math.random(),
+                                     (c.y != null) ? c.y: _bounds.topleft.y + h*Math.random())
+
+        
+        active.particles[id] = new Particle(randomish_pt, mass);
+        active.particles[id].connections = 0
+        active.particles[id].fixed = (c.f===1)
+        free.particles[id] = active.particles[id]
+        particles.push(active.particles[id])        
+      },
+
+      dropNode:function(c){
+        var id = c.id
+        var dropping = active.particles[id]
+        var idx = $.inArray(dropping, particles)
+        if (idx>-1) particles.splice(idx,1)
+        delete active.particles[id]
+        delete free.particles[id]
+      },
+
+      modifyNode:function(id, mods){
+        if (id in active.particles){
+          var pt = active.particles[id]
+          if ('x' in mods) pt.p.x = mods.x
+          if ('y' in mods) pt.p.y = mods.y
+          if ('m' in mods) pt.m = mods.m
+          if ('f' in mods) pt.fixed = (mods.f===1)
+          if ('_m' in mods){
+            if (pt._m===undefined) pt._m = pt.m
+            pt.m = mods._m            
+          }
+        }
+      },
+
+      addSpring:function(c){
+        var id = c.id
+        var length = c.l
+        var from = active.particles[c.fm]
+        var to = active.particles[c.to]
+        
+        if (from!==undefined && to!==undefined){
+          active.springs[id] = new Spring(from, to, length, that.stiffness)
+          springs.push(active.springs[id])
+          
+          from.connections++
+          to.connections++
+          
+          delete free.particles[c.fm]
+          delete free.particles[c.to]
+        }
+      },
+
+      dropSpring:function(c){
+        var id = c.id
+        var dropping = active.springs[id]
+        
+        dropping.point1.connections--
+        dropping.point2.connections--
+        
+        var idx = $.inArray(dropping, springs)
+        if (idx>-1){
+           springs.splice(idx,1)
+        }
+        delete active.springs[id]
+      },
+
+      _update:function(changes){
+        // batch changes phoned in (automatically) by a ParticleSystem
+        _epoch++
+        
+        $.each(changes, function(i, c){
+          if (c.t in that) that[c.t](c)
+        })
+        return _epoch
+      },
+
+      tick:function(){
+        that.tendParticles()
+        if (that.integrator=='euler'){
+          that.updateForces()
+          that.updateVelocity(that.dt)
+          that.updatePosition(that.dt)
+        }else{
+          // default to verlet
+          that.updateForces();
+          that.cacheForces();           // snapshot f(t)
+          that.updatePosition(that.dt); // update position to x(t + 1)
+          that.updateForces();          // calculate f(t+1)
+          that.updateVelocity(that.dt); // update using f(t) and f(t+1) 
+        }
+        that.tock()
+      },
+
+      tock:function(){
+        var coords = []
+        $.each(active.particles, function(id, pt){
+          coords.push(id)
+          coords.push(pt.p.x)
+          coords.push(pt.p.y)
+        })
+
+        if (updateFn) updateFn({geometry:coords, epoch:_epoch, energy:_energy, bounds:_bounds})
+      },
+
+      tendParticles:function(){
+        $.each(active.particles, function(id, pt){
+          // decay down any of the temporary mass increases that were passed along
+          // by using an {_m:} instead of an {m:} (which is to say via a Node having
+          // its .tempMass attr set)
+          if (pt._m!==undefined){
+            if (Math.abs(pt.m-pt._m)<1){
+              pt.m = pt._m
+              delete pt._m
+            }else{
+              pt.m *= .98
+            }
+          }
+
+          // zero out the velocity from one tick to the next
+          pt.v.x = pt.v.y = 0           
+        })
+
+      },
+      
+      
+      // Physics stuff      
+      updateForces:function() {
+        if (that.repulsion>0){
+          if (that.theta>0) that.applyBarnesHutRepulsion()
+          else that.applyBruteForceRepulsion()
+        }
+        if (that.stiffness>0) that.applySprings()
+        that.applyCenterDrift()
+        if (that.gravity) that.applyCenterGravity()
+      },
+      
+      cacheForces:function() {
+        // keep a snapshot of the current forces for the verlet integrator
+        $.each(active.particles, function(id, point) {
+           point._F = point.f;
+           point._m = point.m;
+        });
+      },
+      
+      applyBruteForceRepulsion:function(){
+        $.each(active.particles, function(id1, point1){
+          $.each(active.particles, function(id2, point2){
+            if (point1 !== point2){
+              var d = point1.p.subtract(point2.p);
+              var distance = Math.max(1.0, d.magnitude());
+              var direction = ((d.magnitude()>0) ? d : Point.random(1)).normalize()
+
+              // apply force to each end point
+              // (consult the cached `real' mass value if the mass is being poked to allow
+              // for repositioning. the poked mass will still be used in .applyforce() so
+              // all should be well)
+              point1.applyForce(direction.multiply(that.repulsion*(point2._m||point2.m)*.5)
+                                         .divide(distance * distance * 0.5) );
+              point2.applyForce(direction.multiply(that.repulsion*(point1._m||point1.m)*.5)
+                                         .divide(distance * distance * -0.5) );
+
+            }
+          })          
+        })
+      },
+      
+      applyBarnesHutRepulsion:function(){
+        if (!_bounds.topleft || !_bounds.bottomright) return
+        var bottomright = new Point(_bounds.bottomright)
+        var topleft = new Point(_bounds.topleft)
+
+        // build a barnes-hut tree...
+        bhTree.init(topleft, bottomright, that.theta)        
+        $.each(active.particles, function(id, particle){
+          bhTree.insert(particle)
+        })
+        
+        // ...and use it to approximate the repulsion forces
+        $.each(active.particles, function(id, particle){
+          bhTree.applyForces(particle, that.repulsion)
+        })
+      },
+      
+      applySprings:function(){
+        $.each(active.springs, function(id, spring){
+          var d = spring.point2.p.subtract(spring.point1.p); // the direction of the spring
+          var displacement = spring.length - d.magnitude()//Math.max(.1, d.magnitude());
+          var direction = ( (d.magnitude()>0) ? d : Point.random(1) ).normalize()
+
+          // BUG:
+          // since things oscillate wildly for hub nodes, should probably normalize spring
+          // forces by the number of incoming edges for each node. naive normalization 
+          // doesn't work very well though. what's the `right' way to do it?
+
+          // apply force to each end point
+          spring.point1.applyForce(direction.multiply(spring.k * displacement * -0.5))
+          spring.point2.applyForce(direction.multiply(spring.k * displacement * 0.5))
+        });
+      },
+
+
+      applyCenterDrift:function(){
+        // find the centroid of all the particles in the system and shift everything
+        // so the cloud is centered over the origin
+        var numParticles = 0
+        var centroid = new Point(0,0)
+        $.each(active.particles, function(id, point) {
+          centroid.add(point.p)
+          numParticles++
+        });
+
+        if (numParticles==0) return
+        
+        var correction = centroid.divide(-numParticles)
+        $.each(active.particles, function(id, point) {
+          point.applyForce(correction)
+        })
+        
+      },
+      applyCenterGravity:function(){
+        // attract each node to the origin
+        $.each(active.particles, function(id, point) {
+          var direction = point.p.multiply(-1.0);
+          point.applyForce(direction.multiply(that.repulsion / 100.0));
+        });
+      },
+      
+      updateVelocity:function(timestep){
+        // translate forces to a new velocity for this particle
+        var sum=0, max=0, n = 0;
+        $.each(active.particles, function(id, point) {
+          if (point.fixed){
+             point.v = new Point(0,0)
+             point.f = new Point(0,0)
+             return
+          }
+
+          if (that.integrator=='euler'){
+            point.v = point.v.add(point.f.multiply(timestep)).multiply(1-that.friction);
+          }else{
+            point.v = point.v.add(point.f.add(point._F.divide(point._m)).multiply(timestep*0.5)).multiply(1-that.friction);
+          }
+          point.f.x = point.f.y = 0
+
+          var speed = point.v.magnitude()          
+          if (speed>SPEED_LIMIT) point.v = point.v.divide(speed*speed)
+
+          var speed = point.v.magnitude();
+          var e = speed*speed
+          sum += e
+          max = Math.max(e,max)
+          n++
+        });
+        _energy = {sum:sum, max:max, mean:sum/n, n:n}
+        
+      },
+
+      updatePosition:function(timestep){
+        // translate velocity to a position delta
+        var bottomright = null
+        var topleft = null        
+        
+        $.each(active.particles, function(i, point) {
+
+          // move the node to its new position
+          if (that.integrator=='euler'){
+            point.p = point.p.add(point.v.multiply(timestep));
+          }else{
+            //this should follow the equation
+            //x(t+1) = x(t) + v(t) * timestep + 1/2 * timestep^2 * a(t)
+            var accelPart = point.f.multiply(0.5 * timestep * timestep).divide(point.m);
+            point.p = point.p.add(point.v.multiply(timestep)).add(accelPart);
+          }
+          
+          if (!bottomright){
+            bottomright = new Point(point.p.x, point.p.y)
+            topleft = new Point(point.p.x, point.p.y)
+            return
+          }
+        
+          var pt = point.p
+          if (pt.x===null || pt.y===null) return
+          if (pt.x > bottomright.x) bottomright.x = pt.x;
+          if (pt.y > bottomright.y) bottomright.y = pt.y;          
+          if (pt.x < topleft.x)     topleft.x = pt.x;
+          if (pt.y < topleft.y)     topleft.y = pt.y;
+        });
+        
+        _bounds = {topleft:topleft||new Point(-1,-1), bottomright:bottomright||new Point(1,1)}
+      },
+
+      systemEnergy:function(timestep){
+        // system stats
+        return _energy
+      }
+
+      
+    }
+    return that.init()
+  }
+  
+  var _nearParticle = function(center_pt, r){
+      var r = r || .0
+      var x = center_pt.x
+      var y = center_pt.y
+      var d = r*2
+      return new Point(x-r+Math.random()*d, y-r+Math.random()*d)
+  }
diff --git a/arbor_src/physics/system.js b/arbor_src/physics/system.js
new file mode 100644
index 00000000..3ce52ee1
--- /dev/null
+++ b/arbor_src/physics/system.js
@@ -0,0 +1,621 @@
+//
+// system.js
+//
+// the main controller object for creating/modifying graphs 
+//
+
+  var ParticleSystem = function(repulsion, stiffness, friction, centerGravity, targetFps, dt, precision, integrator){
+  // also callable with ({integrator:, stiffness:, repulsion:, friction:, timestep:, fps:, dt:, gravity:})
+    
+    var _changes=[]
+    var _notification=null
+    var _epoch = 0
+
+    var _screenSize = null
+    var _screenStep = .04
+    var _screenPadding = [20,20,20,20]
+    var _bounds = null
+    var _boundsTarget = null
+
+    if (typeof repulsion=='object'){
+      var _p = repulsion
+      friction = _p.friction
+      repulsion = _p.repulsion
+      targetFps = _p.fps
+      dt = _p.dt
+      stiffness = _p.stiffness
+      centerGravity = _p.gravity
+      precision = _p.precision
+      integrator = _p.integrator
+    }
+
+    // param validation and defaults
+    if (integrator!='verlet' && integrator!='euler') integrator='verlet'
+    friction = isNaN(friction) ? .5 : friction
+    repulsion = isNaN(repulsion) ? 1000 : repulsion
+    targetFps = isNaN(targetFps) ? 55 : targetFps
+    stiffness = isNaN(stiffness) ? 600 : stiffness
+    dt = isNaN(dt) ? 0.02 : dt
+    precision = isNaN(precision) ? .6 : precision
+    centerGravity = (centerGravity===true)
+
+    var _systemTimeout = (targetFps!==undefined) ? 1000/targetFps : 1000/50
+    var _parameters = {integrator:integrator, repulsion:repulsion, stiffness:stiffness, friction:friction, dt:dt, gravity:centerGravity, precision:precision, timeout:_systemTimeout}
+    var _energy
+
+    var state = {
+      renderer:null, // this is set by the library user
+      tween:null, // gets filled in by the Kernel
+      nodes:{}, // lookup based on node _id's from the worker
+      edges:{}, // likewise
+      adjacency:{}, // {name1:{name2:{}, name3:{}}}
+      names:{}, // lookup table based on 'name' field in data objects
+      kernel: null
+    }
+
+    var that={
+      parameters:function(newParams){
+        if (newParams!==undefined){
+          if (!isNaN(newParams.precision)){
+            newParams.precision = Math.max(0, Math.min(1, newParams.precision))
+          }
+          $.each(_parameters, function(p, v){
+            if (newParams[p]!==undefined) _parameters[p] = newParams[p]
+          })
+          state.kernel.physicsModified(newParams)
+        }
+        return _parameters
+      },
+
+      fps:function(newFPS){
+        if (newFPS===undefined) return state.kernel.fps()
+        else that.parameters({timeout:1000/(newFPS||50)})
+      },
+
+      start:function(){
+        state.kernel.start()
+      },
+
+      stop:function(){
+        state.kernel.stop()
+      },
+
+      addNode:function(name, data){
+        data = data || {}
+        var priorNode = state.names[name]
+        if (priorNode){
+          priorNode.data = data
+          return priorNode
+        }else if (name!=undefined){
+          // the data object has a few magic fields that are actually used
+          // by the simulation:
+          //   'mass' overrides the default of 1
+          //   'fixed' overrides the default of false
+          //   'x' & 'y' will set a starting position rather than 
+          //             defaulting to random placement
+          var x = (data.x!=undefined) ? data.x : null
+          var y = (data.y!=undefined) ? data.y : null
+          var fixed = (data.fixed) ? 1 : 0
+
+          var node = new Node(data)
+          node.name = name
+          state.names[name] = node
+          state.nodes[node._id] = node;
+
+          _changes.push({t:"addNode", id:node._id, m:node.mass, x:x, y:y, f:fixed})
+          that._notify();
+          return node;
+
+        }
+      },
+
+      // remove a node and its associated edges from the graph
+      pruneNode:function(nodeOrName) {
+        var node = that.getNode(nodeOrName)
+        
+        if (typeof(state.nodes[node._id]) !== 'undefined'){
+          delete state.nodes[node._id]
+          delete state.names[node.name]
+        }
+
+
+        $.each(state.edges, function(id, e){
+          if (e.source._id === node._id || e.target._id === node._id){
+            that.pruneEdge(e);
+          }
+        })
+
+        _changes.push({t:"dropNode", id:node._id})
+        that._notify();
+      },
+
+      getNode:function(nodeOrName){
+        if (nodeOrName._id!==undefined){
+          return nodeOrName
+        }else if (typeof nodeOrName=='string' || typeof nodeOrName=='number'){
+          return state.names[nodeOrName]
+        }
+        // otherwise let it return undefined
+      },
+
+      eachNode:function(callback){
+        // callback should accept two arguments: Node, Point
+        $.each(state.nodes, function(id, n){
+          if (n._p.x==null || n._p.y==null) return
+          var pt = (_screenSize!==null) ? that.toScreen(n._p) : n._p
+          callback.call(that, n, pt);
+        })
+      },
+
+      addEdge:function(source, target, data){
+        source = that.getNode(source) || that.addNode(source)
+        target = that.getNode(target) || that.addNode(target)
+        data = data || {}
+        var edge = new Edge(source, target, data);
+
+        var src = source._id
+        var dst = target._id
+        state.adjacency[src] = state.adjacency[src] || {}
+        state.adjacency[src][dst] = state.adjacency[src][dst] || []
+
+        var exists = (state.adjacency[src][dst].length > 0)
+        if (exists){
+          // probably shouldn't allow multiple edges in same direction
+          // between same nodes? for now just overwriting the data...
+          $.extend(state.adjacency[src][dst].data, edge.data)
+          return
+        }else{
+          state.edges[edge._id] = edge
+          state.adjacency[src][dst].push(edge)
+          var len = (edge.length!==undefined) ? edge.length : 1
+          _changes.push({t:"addSpring", id:edge._id, fm:src, to:dst, l:len})
+          that._notify()
+        }
+
+        return edge;
+
+      },
+
+      // remove an edge and its associated lookup entries
+      pruneEdge:function(edge) {
+
+        _changes.push({t:"dropSpring", id:edge._id})
+        delete state.edges[edge._id]
+        
+        for (var x in state.adjacency){
+          for (var y in state.adjacency[x]){
+            var edges = state.adjacency[x][y];
+
+            for (var j=edges.length - 1; j>=0; j--)  {
+              if (state.adjacency[x][y][j]._id === edge._id){
+                state.adjacency[x][y].splice(j, 1);
+              }
+            }
+          }
+        }
+
+        that._notify();
+      },
+
+      // find the edges from node1 to node2
+      getEdges:function(node1, node2) {
+        node1 = that.getNode(node1)
+        node2 = that.getNode(node2)
+        if (!node1 || !node2) return []
+        
+        if (typeof(state.adjacency[node1._id]) !== 'undefined'
+          && typeof(state.adjacency[node1._id][node2._id]) !== 'undefined'){
+          return state.adjacency[node1._id][node2._id];
+        }
+
+        return [];
+      },
+
+      getEdgesFrom:function(node) {
+        node = that.getNode(node)
+        if (!node) return []
+        
+        if (typeof(state.adjacency[node._id]) !== 'undefined'){
+          var nodeEdges = []
+          $.each(state.adjacency[node._id], function(id, subEdges){
+            nodeEdges = nodeEdges.concat(subEdges)
+          })
+          return nodeEdges
+        }
+
+        return [];
+      },
+
+      getEdgesTo:function(node) {
+        node = that.getNode(node)
+        if (!node) return []
+
+        var nodeEdges = []
+        $.each(state.edges, function(edgeId, edge){
+          if (edge.target == node) nodeEdges.push(edge)
+        })
+        
+        return nodeEdges;
+      },
+
+      eachEdge:function(callback){
+        // callback should accept two arguments: Edge, Point
+        $.each(state.edges, function(id, e){
+          var p1 = state.nodes[e.source._id]._p
+          var p2 = state.nodes[e.target._id]._p
+
+
+          if (p1.x==null || p2.x==null) return
+          
+          p1 = (_screenSize!==null) ? that.toScreen(p1) : p1
+          p2 = (_screenSize!==null) ? that.toScreen(p2) : p2
+          
+          if (p1 && p2) callback.call(that, e, p1, p2);
+        })
+      },
+
+
+      prune:function(callback){
+        // callback should be of the form ƒ(node, {from:[],to:[]})
+
+        var changes = {dropped:{nodes:[], edges:[]}}
+        if (callback===undefined){
+          $.each(state.nodes, function(id, node){
+            changes.dropped.nodes.push(node)
+            that.pruneNode(node)
+          })
+        }else{
+          that.eachNode(function(node){
+            var drop = callback.call(that, node, {from:that.getEdgesFrom(node), to:that.getEdgesTo(node)})
+            if (drop){
+              changes.dropped.nodes.push(node)
+              that.pruneNode(node)
+            }
+          })
+        }
+        // trace('prune', changes.dropped)
+        return changes
+      },
+      
+      graft:function(branch){
+        // branch is of the form: { nodes:{name1:{d}, name2:{d},...}, 
+        //                          edges:{fromNm:{toNm1:{d}, toNm2:{d}}, ...} }
+
+        var changes = {added:{nodes:[], edges:[]}}
+        if (branch.nodes) $.each(branch.nodes, function(name, nodeData){
+          var oldNode = that.getNode(name)
+          // should probably merge any x/y/m data as well...
+          // if (oldNode) $.extend(oldNode.data, nodeData)
+          
+          if (oldNode) oldNode.data = nodeData
+          else changes.added.nodes.push( that.addNode(name, nodeData) )
+          
+          state.kernel.start()
+        })
+        
+        if (branch.edges) $.each(branch.edges, function(src, dsts){
+          var srcNode = that.getNode(src)
+          if (!srcNode) changes.added.nodes.push( that.addNode(src, {}) )
+
+          $.each(dsts, function(dst, edgeData){
+
+            // should probably merge any x/y/m data as well...
+            // if (srcNode) $.extend(srcNode.data, nodeData)
+
+
+            // i wonder if it should spawn any non-existant nodes that are part
+            // of one of these edge requests...
+            var dstNode = that.getNode(dst)
+            if (!dstNode) changes.added.nodes.push( that.addNode(dst, {}) )
+
+            var oldEdges = that.getEdges(src, dst)
+            if (oldEdges.length>0){
+              // trace("update",src,dst)
+              oldEdges[0].data = edgeData
+            }else{
+            // trace("new ->",src,dst)
+              changes.added.edges.push( that.addEdge(src, dst, edgeData) )
+            }
+          })
+        })
+
+        // trace('graft', changes.added)
+        return changes
+      },
+
+      merge:function(branch){
+        var changes = {added:{nodes:[], edges:[]}, dropped:{nodes:[], edges:[]}}
+
+        $.each(state.edges, function(id, edge){
+          // if ((branch.edges[edge.source.name]===undefined || branch.edges[edge.source.name][edge.target.name]===undefined) &&
+          //     (branch.edges[edge.target.name]===undefined || branch.edges[edge.target.name][edge.source.name]===undefined)){
+          if ((branch.edges[edge.source.name]===undefined || branch.edges[edge.source.name][edge.target.name]===undefined)){
+                that.pruneEdge(edge)
+                changes.dropped.edges.push(edge)
+              }
+        })
+        
+        var prune_changes = that.prune(function(node, edges){
+          if (branch.nodes[node.name] === undefined){
+            changes.dropped.nodes.push(node)
+            return true
+          }
+        })
+        var graft_changes = that.graft(branch)        
+        changes.added.nodes = changes.added.nodes.concat(graft_changes.added.nodes)
+        changes.added.edges = changes.added.edges.concat(graft_changes.added.edges)
+        changes.dropped.nodes = changes.dropped.nodes.concat(prune_changes.dropped.nodes)
+        changes.dropped.edges = changes.dropped.edges.concat(prune_changes.dropped.edges)
+        
+        // trace('changes', changes)
+        return changes
+      },
+
+      
+      tweenNode:function(nodeOrName, dur, to){
+        var node = that.getNode(nodeOrName)
+        if (node) state.tween.to(node, dur, to)
+      },
+
+      tweenEdge:function(a,b,c,d){
+        if (d===undefined){
+          // called with (edge, dur, to)
+          that._tweenEdge(a,b,c)
+        }else{
+          // called with (node1, node2, dur, to)
+          var edges = that.getEdges(a,b)
+          $.each(edges, function(i, edge){
+            that._tweenEdge(edge, c, d)    
+          })
+        }
+      },
+
+      _tweenEdge:function(edge, dur, to){
+        if (edge && edge._id!==undefined) state.tween.to(edge, dur, to)
+      },
+
+      _updateGeometry:function(e){
+        if (e != undefined){          
+          var stale = (e.epoch<_epoch)
+
+          _energy = e.energy
+          var pts = e.geometry // an array of the form [id1,x1,y1, id2,x2,y2, ...]
+          if (pts!==undefined){
+            for (var i=0, j=pts.length/3; i<j; i++){
+              var id = pts[3*i]
+                            
+              // canary silencer...
+              if (stale && state.nodes[id]==undefined) continue
+              
+              state.nodes[id]._p.x = pts[3*i + 1]
+              state.nodes[id]._p.y = pts[3*i + 2]
+            }
+          }          
+        }
+      },
+      
+      // convert to/from screen coordinates
+      screen:function(opts){
+        if (opts == undefined) return {size:(_screenSize)? objcopy(_screenSize) : undefined, 
+                                       padding:_screenPadding.concat(), 
+                                       step:_screenStep}
+        if (opts.size!==undefined) that.screenSize(opts.size.width, opts.size.height)
+        if (!isNaN(opts.step)) that.screenStep(opts.step)
+        if (opts.padding!==undefined) that.screenPadding(opts.padding)
+      },
+      
+      screenSize:function(canvasWidth, canvasHeight){
+        _screenSize = {width:canvasWidth,height:canvasHeight}
+        that._updateBounds()
+      },
+
+      screenPadding:function(t,r,b,l){
+        if ($.isArray(t)) trbl = t
+        else trbl = [t,r,b,l]
+
+        var top = trbl[0]
+        var right = trbl[1]
+        var bot = trbl[2]
+        if (right===undefined) trbl = [top,top,top,top]
+        else if (bot==undefined) trbl = [top,right,top,right]
+        
+        _screenPadding = trbl
+      },
+
+      screenStep:function(stepsize){
+        _screenStep = stepsize
+      },
+
+      toScreen:function(p) {
+        if (!_bounds || !_screenSize) return
+        // trace(p.x, p.y)
+
+        var _padding = _screenPadding || [0,0,0,0]
+        var size = _bounds.bottomright.subtract(_bounds.topleft)
+        var sx = _padding[3] + p.subtract(_bounds.topleft).divide(size.x).x * (_screenSize.width - (_padding[1] + _padding[3]))
+        var sy = _padding[0] + p.subtract(_bounds.topleft).divide(size.y).y * (_screenSize.height - (_padding[0] + _padding[2]))
+
+        // return arbor.Point(Math.floor(sx), Math.floor(sy))
+        return arbor.Point(sx, sy)
+      },
+      
+      fromScreen:function(s) {
+        if (!_bounds || !_screenSize) return
+
+        var _padding = _screenPadding || [0,0,0,0]
+        var size = _bounds.bottomright.subtract(_bounds.topleft)
+        var px = (s.x-_padding[3]) / (_screenSize.width-(_padding[1]+_padding[3]))  * size.x + _bounds.topleft.x
+        var py = (s.y-_padding[0]) / (_screenSize.height-(_padding[0]+_padding[2])) * size.y + _bounds.topleft.y
+
+        return arbor.Point(px, py);
+      },
+
+      _updateBounds:function(newBounds){
+        // step the renderer's current bounding box closer to the true box containing all
+        // the nodes. if _screenStep is set to 1 there will be no lag. if _screenStep is
+        // set to 0 the bounding box will remain stationary after being initially set 
+        if (_screenSize===null) return
+        
+        if (newBounds) _boundsTarget = newBounds
+        else _boundsTarget = that.bounds()
+        
+        // _boundsTarget = newBounds || that.bounds()
+        // _boundsTarget.topleft = new Point(_boundsTarget.topleft.x,_boundsTarget.topleft.y)
+        // _boundsTarget.bottomright = new Point(_boundsTarget.bottomright.x,_boundsTarget.bottomright.y)
+
+        var bottomright = new Point(_boundsTarget.bottomright.x, _boundsTarget.bottomright.y)
+        var topleft = new Point(_boundsTarget.topleft.x, _boundsTarget.topleft.y)
+        var dims = bottomright.subtract(topleft)
+        var center = topleft.add(dims.divide(2))
+
+
+        var MINSIZE = 4                                   // perfect-fit scaling
+        // MINSIZE = Math.max(Math.max(MINSIZE,dims.y), dims.x) // proportional scaling
+
+        var size = new Point(Math.max(dims.x,MINSIZE), Math.max(dims.y,MINSIZE))
+        _boundsTarget.topleft = center.subtract(size.divide(2))
+        _boundsTarget.bottomright = center.add(size.divide(2))
+
+        if (!_bounds){
+          if ($.isEmptyObject(state.nodes)) return false
+          _bounds = _boundsTarget
+          return true
+        }
+        
+        // var stepSize = (Math.max(dims.x,dims.y)<MINSIZE) ? .2 : _screenStep
+        var stepSize = _screenStep
+        _newBounds = {
+          bottomright: _bounds.bottomright.add( _boundsTarget.bottomright.subtract(_bounds.bottomright).multiply(stepSize) ),
+          topleft: _bounds.topleft.add( _boundsTarget.topleft.subtract(_bounds.topleft).multiply(stepSize) )
+        }
+        
+        // return true if we're still approaching the target, false if we're ‘close enough’
+        var diff = new Point(_bounds.topleft.subtract(_newBounds.topleft).magnitude(), _bounds.bottomright.subtract(_newBounds.bottomright).magnitude())        
+        if (diff.x*_screenSize.width>1 || diff.y*_screenSize.height>1){
+          _bounds = _newBounds
+          return true
+        }else{
+         return false        
+        }
+      },
+
+      energy:function(){
+        return _energy
+      },
+
+      bounds:function(){
+        //  TL   -1
+        //     -1   1
+        //        1   BR
+        var bottomright = null
+        var topleft = null
+
+        // find the true x/y range of the nodes
+        $.each(state.nodes, function(id, node){
+          if (!bottomright){
+            bottomright = new Point(node._p)
+            topleft = new Point(node._p)
+            return
+          }
+        
+          var point = node._p
+          if (point.x===null || point.y===null) return
+          if (point.x > bottomright.x) bottomright.x = point.x;
+          if (point.y > bottomright.y) bottomright.y = point.y;          
+          if   (point.x < topleft.x)   topleft.x = point.x;
+          if   (point.y < topleft.y)   topleft.y = point.y;
+        })
+
+
+        // return the true range then let to/fromScreen handle the padding
+        if (bottomright && topleft){
+          return {bottomright: bottomright, topleft: topleft}
+        }else{
+          return {topleft: new Point(-1,-1), bottomright: new Point(1,1)};
+        }
+      },
+
+      // Find the nearest node to a particular position
+      nearest:function(pos){
+        if (_screenSize!==null) pos = that.fromScreen(pos)
+        // if screen size has been specified, presume pos is in screen pixel
+        // units and convert it back to the particle system coordinates
+        
+        var min = {node: null, point: null, distance: null};
+        var t = that;
+        
+        $.each(state.nodes, function(id, node){
+          var pt = node._p
+          if (pt.x===null || pt.y===null) return
+          var distance = pt.subtract(pos).magnitude();
+          if (min.distance === null || distance < min.distance){
+            min = {node: node, point: pt, distance: distance};
+            if (_screenSize!==null) min.screenPoint = that.toScreen(pt)
+          }
+        })
+        
+        if (min.node){
+          if (_screenSize!==null) min.distance = that.toScreen(min.node.p).subtract(that.toScreen(pos)).magnitude()
+           return min
+        }else{
+           return null
+        }
+      },
+
+      _notify:function() {
+        // pass on graph changes to the physics object in the worker thread
+        // (using a short timeout to batch changes)
+        if (_notification===null) _epoch++
+        else clearTimeout(_notification)
+        
+        _notification = setTimeout(that._synchronize,20)
+        // that._synchronize()
+      },
+      _synchronize:function(){
+        if (_changes.length>0){
+          state.kernel.graphChanged(_changes)
+          _changes = []
+          _notification = null
+        }
+      },
+    }    
+    
+    state.kernel = Kernel(that)
+    state.tween = state.kernel.tween || null
+    
+    // some magic attrs to make the Node objects phone-home their physics-relevant changes
+    Node.prototype.__defineGetter__("p", function() { 
+      var self = this
+      var roboPoint = {}
+      roboPoint.__defineGetter__('x', function(){ return self._p.x; })
+      roboPoint.__defineSetter__('x', function(newX){ state.kernel.particleModified(self._id, {x:newX}) })
+      roboPoint.__defineGetter__('y', function(){ return self._p.y; })
+      roboPoint.__defineSetter__('y', function(newY){ state.kernel.particleModified(self._id, {y:newY}) })
+      roboPoint.__proto__ = Point.prototype
+      return roboPoint
+    })
+    Node.prototype.__defineSetter__("p", function(newP) { 
+      this._p.x = newP.x
+      this._p.y = newP.y
+      state.kernel.particleModified(this._id, {x:newP.x, y:newP.y})
+    })
+
+    Node.prototype.__defineGetter__("mass", function() { return this._mass; });
+    Node.prototype.__defineSetter__("mass", function(newM) { 
+      this._mass = newM
+      state.kernel.particleModified(this._id, {m:newM})
+    })
+
+    Node.prototype.__defineSetter__("tempMass", function(newM) { 
+      state.kernel.particleModified(this._id, {_m:newM})
+    })
+      
+    Node.prototype.__defineGetter__("fixed", function() { return this._fixed; });
+    Node.prototype.__defineSetter__("fixed", function(isFixed) { 
+      this._fixed = isFixed
+      state.kernel.particleModified(this._id, {f:isFixed?1:0})
+    })
+    
+    return that
+  }
+  
\ No newline at end of file
diff --git a/arbor_src/physics/worker.js b/arbor_src/physics/worker.js
new file mode 100644
index 00000000..0a5a2c80
--- /dev/null
+++ b/arbor_src/physics/worker.js
@@ -0,0 +1,157 @@
+//
+// worker.js
+//
+// wraps physics.js in an onMessage/postMessage protocol that the
+// Kernel object can deal with
+//
+importScripts('atoms.js');
+importScripts('barnes-hut.js');  
+importScripts('physics.js');  
+// alias over the missing jquery utils so we can run in a worker
+$ = {
+  each:function(obj, callback){
+    if ($.isArray(obj)){
+      for (var i=0, j=obj.length; i<j; i++) callback(i, obj[i])
+    }else{
+      for (var k in obj) callback(k, obj[k])
+    }
+  },
+  map:function(arr, fn){
+    var out = []
+    $.each(arr, function(i, elt){
+      var result = fn(elt, i)
+      if (result!==undefined) out.push(result)
+    })
+    return out
+  },
+
+  isArray:function(obj){
+    return (obj.constructor.toString().indexOf("Array") != -1)
+  },
+
+  inArray:function(elt, arr){
+    for (var i=0, j=arr.length; i<j; i++) if (arr[i]===elt) return i;
+    return -1
+  }    
+}
+// endalias
+var PhysicsWorker = function(){
+  var _timeout = 20
+  var _physics = null
+  var _physicsInterval = null
+  var _lastTick = null
+  
+  var times = []
+  var last = new Date().valueOf()
+  
+  var that = {  
+    init:function(param){
+      that.timeout(param.timeout)
+      _physics = Physics(param.dt, param.stiffness, param.repulsion, param.friction, that.tock)
+      return that
+    },
+    timeout:function(newTimeout){
+      if (newTimeout!=_timeout){
+        _timeout = newTimeout
+        if (_physicsInterval!==null){
+          that.stop()
+          that.go()
+        }
+      }
+    },
+    go:function(){
+      if (_physicsInterval!==null) return
+
+      // postMessage('starting')
+      _lastTick=null
+      _physicsInterval = setInterval(that.tick, _timeout)
+    },
+    stop:function(){
+      if (_physicsInterval===null) return
+      clearInterval(_physicsInterval);
+      _physicsInterval = null;
+      // postMessage('stopping')
+    },
+    tick:function(){
+      // iterate the system
+      _physics.tick()    
+
+
+      // but stop the simulation when energy of the system goes below a threshold
+      var sysEnergy = _physics.systemEnergy()
+      if ((sysEnergy.mean + sysEnergy.max)/2 < 0.05){
+        if (_lastTick===null) _lastTick=new Date().valueOf()
+        if (new Date().valueOf()-_lastTick>1000){
+          that.stop()
+        }else{
+          // postMessage('pausing')
+        }
+      }else{
+        _lastTick = null
+      }
+      
+    },
+
+    tock:function(sysData){
+      sysData.type = "geometry"
+      postMessage(sysData)
+    },
+    
+    modifyNode:function(id, mods){
+      _physics.modifyNode(id, mods)  
+      that.go()
+    },
+
+    modifyPhysics:function(param){
+      _physics.modifyPhysics(param)
+    },
+    
+    update:function(changes){
+      var epoch = _physics._update(changes)
+    }
+  }
+  
+  return that
+}
+
+
+var physics = PhysicsWorker()
+
+onmessage = function(e){
+  if (!e.data.type){
+    postMessage("¿kérnèl?")
+    return
+  }
+  
+  if (e.data.type=='physics'){
+    var param = e.data.physics
+    physics.init(e.data.physics)
+    return
+  }
+  
+  switch(e.data.type){
+    case "modify":
+      physics.modifyNode(e.data.id, e.data.mods)
+      break
+
+    case "changes":
+      physics.update(e.data.changes)
+      physics.go()
+      break
+      
+    case "start":
+      physics.go()
+      break
+      
+    case "stop":
+      physics.stop()
+      break
+      
+    case "sys":
+      var param = e.data.param || {}
+      if (!isNaN(param.timeout)) physics.timeout(param.timeout)
+      physics.modifyPhysics(param)
+      physics.go()
+      break
+    }  
+}
diff --git a/arbor_src/tween/easing.js b/arbor_src/tween/easing.js
new file mode 100644
index 00000000..ab7e52b3
--- /dev/null
+++ b/arbor_src/tween/easing.js
@@ -0,0 +1,171 @@
+//
+// easing.js
+// the world-famous penner easing equations
+//
+
+/*
+ *
+ * TERMS OF USE - EASING EQUATIONS
+ * 
+ * Open source under the BSD License. 
+ * 
+ * Copyright © 2001 Robert Penner
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification, 
+ * are permitted provided that the following conditions are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice, this list of 
+ * conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice, this list 
+ * of conditions and the following disclaimer in the documentation and/or other materials 
+ * provided with the distribution.
+ * 
+ * Neither the name of the author nor the names of contributors may be used to endorse 
+ * or promote products derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
+ * OF THE POSSIBILITY OF SUCH DAMAGE. 
+ *
+ */
+ 
+ var Easing = (function(){
+  var that = {
+    // t: current time, b: beginning value, c: change in value, d: duration   
+    linear: function(t, b, c, d){
+      return c*(t/d) + b
+    },
+    quadin: function (t, b, c, d) {
+  		return c*(t/=d)*t + b;
+  	},
+    quadout: function (t, b, c, d) {
+  		return -c *(t/=d)*(t-2) + b;
+  	},
+    quadinout: function (t, b, c, d) {
+  		if ((t/=d/2) < 1) return c/2*t*t + b;
+  		return -c/2 * ((--t)*(t-2) - 1) + b;
+  	},
+    cubicin: function (t, b, c, d) {
+  		return c*(t/=d)*t*t + b;
+  	},
+    cubicout: function (t, b, c, d) {
+  		return c*((t=t/d-1)*t*t + 1) + b;
+  	},
+    cubicinout: function (t, b, c, d) {
+  		if ((t/=d/2) < 1) return c/2*t*t*t + b;
+  		return c/2*((t-=2)*t*t + 2) + b;
+  	},
+    quartin: function (t, b, c, d) {
+  		return c*(t/=d)*t*t*t + b;
+  	},
+    quartout: function (t, b, c, d) {
+  		return -c * ((t=t/d-1)*t*t*t - 1) + b;
+  	},
+    quartinout: function (t, b, c, d) {
+  		if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
+  		return -c/2 * ((t-=2)*t*t*t - 2) + b;
+  	},
+    quintin: function (t, b, c, d) {
+  		return c*(t/=d)*t*t*t*t + b;
+  	},
+    quintout: function (t, b, c, d) {
+  		return c*((t=t/d-1)*t*t*t*t + 1) + b;
+  	},
+    quintinout: function (t, b, c, d) {
+  		if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
+  		return c/2*((t-=2)*t*t*t*t + 2) + b;
+  	},
+    sinein: function (t, b, c, d) {
+  		return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
+  	},
+    sineout: function (t, b, c, d) {
+  		return c * Math.sin(t/d * (Math.PI/2)) + b;
+  	},
+    sineinout: function (t, b, c, d) {
+  		return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
+  	},
+    expoin: function (t, b, c, d) {
+  		return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
+  	},
+    expoout: function (t, b, c, d) {
+  		return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
+  	},
+    expoinout: function (t, b, c, d) {
+  		if (t==0) return b;
+  		if (t==d) return b+c;
+  		if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
+  		return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
+  	},
+    circin: function (t, b, c, d) {
+  		return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
+  	},
+    circout: function (t, b, c, d) {
+  		return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
+  	},
+    circinout: function (t, b, c, d) {
+  		if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
+  		return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
+  	},
+    elasticin: function (t, b, c, d) {
+  		var s=1.70158;var p=0;var a=c;
+  		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
+  		if (a < Math.abs(c)) { a=c; var s=p/4; }
+  		else var s = p/(2*Math.PI) * Math.asin (c/a);
+  		return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
+  	},
+    elasticout: function (t, b, c, d) {
+  		var s=1.70158;var p=0;var a=c;
+  		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
+  		if (a < Math.abs(c)) { a=c; var s=p/4; }
+  		else var s = p/(2*Math.PI) * Math.asin (c/a);
+  		return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
+  	},
+    elasticinout: function (t, b, c, d) {
+  		var s=1.70158;var p=0;var a=c;
+  		if (t==0) return b;  if ((t/=d/2)==2) return b+c;  if (!p) p=d*(.3*1.5);
+  		if (a < Math.abs(c)) { a=c; var s=p/4; }
+  		else var s = p/(2*Math.PI) * Math.asin (c/a);
+  		if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
+  		return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
+  	},
+    backin: function (t, b, c, d, s) {
+  		if (s == undefined) s = 1.70158;
+  		return c*(t/=d)*t*((s+1)*t - s) + b;
+  	},
+    backout: function (t, b, c, d, s) {
+  		if (s == undefined) s = 1.70158;
+  		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
+  	},
+    backinout: function (t, b, c, d, s) {
+  		if (s == undefined) s = 1.70158; 
+  		if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
+  		return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
+  	},
+    bouncein: function (t, b, c, d) {
+  		return c - that.bounceOut (d-t, 0, c, d) + b;
+  	},
+    bounceout: function (t, b, c, d) {
+  		if ((t/=d) < (1/2.75)) {
+  			return c*(7.5625*t*t) + b;
+  		} else if (t < (2/2.75)) {
+  			return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
+  		} else if (t < (2.5/2.75)) {
+  			return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
+  		} else {
+  			return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
+  		}
+  	},
+    bounceinout: function (t, b, c, d) {
+  		if (t < d/2) return that.bounceIn (t*2, 0, c, d) * .5 + b;
+  		return that.bounceOut(t*2-d, 0, c, d) * .5 + c*.5 + b;
+  	}
+	}
+	return that
+})()
\ No newline at end of file
diff --git a/arbor_src/tween/tween.js b/arbor_src/tween/tween.js
new file mode 100644
index 00000000..96b7115f
--- /dev/null
+++ b/arbor_src/tween/tween.js
@@ -0,0 +1,175 @@
+//
+// tween.js
+//
+// interpolator of .data field members for nodes and edges
+//
+
+  var Tween = function(){
+    var _tweens = {}
+    var _done = true
+    
+    var that = {
+      init:function(){
+        return that
+      },
+      
+      busy:function(){
+        var busy = false
+        for (var k in _tweens){ busy=true; break}
+        return busy
+      },
+      
+      to:function(node, dur, to){
+        var now = new Date().valueOf()
+        var seenFields = {}
+
+        var tween = {from:{}, to:{}, colors:{}, node:node, t0:now, t1:now+dur*1000, dur:dur*1000}
+        var easing_fn = "linear"
+        for (var k in to){
+          if (k=='easing'){
+            // need to do better here. case insensitive and default to linear
+            // also be okay with functions getting passed in
+            var ease = to[k].toLowerCase()
+            if (ease in Easing) easing_fn = ease
+            continue
+          }else if (k=='delay'){
+            var delay = (to[k]||0) * 1000
+            tween.t0 += delay
+            tween.t1 += delay
+            continue
+          }
+          
+          if (Colors.validate(to[k])){
+            // it's a hex color string value
+            tween.colors[k] = [Colors.decode(node.data[k]), Colors.decode(to[k]), to[k]]
+            seenFields[k] = true
+          }else{
+            tween.from[k] = (node.data[k]!=undefined) ? node.data[k] : to[k]
+            tween.to[k] = to[k]
+            seenFields[k] = true
+          }
+        }
+        tween.ease = Easing[easing_fn]
+
+        if (_tweens[node._id]===undefined) _tweens[node._id] = []
+        _tweens[node._id].push(tween)
+        
+        // look through queued prunes for any redundancies
+        if (_tweens.length>1){
+          for (var i=_tweens.length-2; i>=0; i++){
+            var tw = _tweens[i]
+
+            for (var k in tw.to){
+              if (k in seenFields) delete tw.to[k]
+              else seenFields[k] = true
+            }
+
+            for (var k in tw.colors){
+              if (k in seenFields) delete tw.colors[k]
+              else seenFields[k] = true
+            }
+
+            if ($.isEmptyObject(tw.colors) && $.isEmptyObject(tw.to)){
+              _tweens.splice(i,1)
+            }
+
+          }
+        }
+        
+        _done = false
+      },
+
+      interpolate:function(pct, src, dst, ease){
+        ease = (ease||"").toLowerCase()
+        var easing_fn = Easing.linear
+        if (ease in Easing) easing_fn = Easing[ease]
+
+        var proportion = easing_fn( pct, 0,1, 1 )
+        if (Colors.validate(src) && Colors.validate(dst)){
+          return lerpRGB(proportion, src,dst)
+        }else if (!isNaN(src)){
+          return lerpNumber(proportion, src,dst)
+        }else if (typeof src=='string'){
+          return (proportion<.5) ? src : dst
+        }
+        
+      },
+
+      tick:function(){
+        var empty = true
+        for (var k in _tweens){ empty=false; break}
+        if (empty) return
+        
+        var now = new Date().valueOf()
+        
+        $.each(_tweens, function(id, tweens){
+          var unprunedTweens = false
+          
+          $.each(tweens, function(i, tween){
+            var proportion = tween.ease( (now-tween.t0), 0,1, tween.dur )
+            proportion = Math.min(1.0, proportion)
+            var from = tween.from
+            var to = tween.to
+            var colors = tween.colors
+            var nodeData = tween.node.data
+
+            var lastTick = (proportion==1.0)
+
+            for (var k in to){
+              switch (typeof to[k]){
+                case "number":
+                  nodeData[k] = lerpNumber(proportion, from[k], to[k])
+                  if (k=='alpha') nodeData[k] = Math.max(0,Math.min(1, nodeData[k]))
+                  break
+                case "string":
+                  if (lastTick){
+                    nodeData[k] = to[k]
+                  }
+                  break
+              }
+            }
+            
+            for (var k in colors){
+              if (lastTick){
+                nodeData[k] = colors[k][2]
+              }else{
+                var rgb = lerpRGB(proportion, colors[k][0], colors[k][1])
+                nodeData[k] = Colors.encode(rgb)
+              }
+            }
+
+            if (lastTick){
+               tween.completed = true
+               unprunedTweens = true
+            }
+          })
+          
+          if (unprunedTweens){
+            _tweens[id] = $.map(tweens, function(t){ if (!t.completed) return t})
+            if (_tweens[id].length==0) delete _tweens[id]
+          }
+        })
+        
+        _done = $.isEmptyObject(_tweens)
+        return _done
+      }
+    }
+    return that.init()
+  }
+  
+  var lerpNumber = function(proportion,from,to){
+    return from + proportion*(to-from)
+  }
+  
+  var lerpRGB = function(proportion,from,to){
+    proportion = Math.max(Math.min(proportion,1),0)
+    var mixture = {}
+    
+    $.each('rgba'.split(""), function(i, c){
+      mixture[c] = Math.round( from[c] + proportion*(to[c]-from[c]) )
+    })
+    return mixture
+  }
+
+  
+// })()
\ No newline at end of file
diff --git a/lib/EventEmitter.min.js b/lib/EventEmitter.min.js
new file mode 100644
index 00000000..6e2ee675
--- /dev/null
+++ b/lib/EventEmitter.min.js
@@ -0,0 +1,7 @@
+/**
+ * EventEmitter v3.1.4
+ * https://github.com/Wolfy87/EventEmitter
+ * 
+ * Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
+ * Oliver Caldwell (olivercaldwell.co.uk)
+ */(function(a){function b(){this._events={},this._maxListeners=10}function c(a,b,c,d,e){this.type=a,this.listener=b,this.scope=c,this.once=d,this.instance=e}"use strict",c.prototype.fire=function(a){this.listener.apply(this.scope||this.instance,a);if(this.once)return this.instance.removeListener(this.type,this.listener,this.scope),!1},b.prototype.eachListener=function(a,b){var c=null,d=null,e=null;if(this._events.hasOwnProperty(a)){d=this._events[a];for(c=0;c<d.length;c+=1){e=b.call(this,d[c],c);if(e===!1)c-=1;else if(e===!0)break}}return this},b.prototype.addListener=function(a,b,d,e){return this._events.hasOwnProperty(a)||(this._events[a]=[]),this._events[a].push(new c(a,b,d,e,this)),this.emit("newListener",a,b,d,e),this._maxListeners&&!this._events[a].warned&&this._events[a].length>this._maxListeners&&(typeof console!="undefined"&&console.warn("Possible EventEmitter memory leak detected. "+this._events[a].length+" listeners added. Use emitter.setMaxListeners() to increase limit."),this._events[a].warned=!0),this},b.prototype.on=b.prototype.addListener,b.prototype.once=function(a,b,c){return this.addListener(a,b,c,!0)},b.prototype.removeListener=function(a,b,c){return this.eachListener(a,function(d,e){d.listener===b&&(!c||d.scope===c)&&this._events[a].splice(e,1)}),this._events[a]&&this._events[a].length===0&&delete this._events[a],this},b.prototype.off=b.prototype.removeListener,b.prototype.removeAllListeners=function(a){return a&&this._events.hasOwnProperty(a)?delete this._events[a]:a||(this._events={}),this},b.prototype.listeners=function(a){if(this._events.hasOwnProperty(a)){var b=[];return this.eachListener(a,function(a){b.push(a.listener)}),b}return[]},b.prototype.emit=function(a){var b=[],c=null;for(c=1;c<arguments.length;c+=1)b.push(arguments[c]);return this.eachListener(a,function(a){return a.fire(b)}),this},b.prototype.setMaxListeners=function(a){return this._maxListeners=a,this},typeof define=="function"&&define.amd?define(function(){return b}):a.EventEmitter=b})(this);
\ No newline at end of file
diff --git a/lib/Tween.js b/lib/Tween.js
new file mode 100644
index 00000000..85eb2997
--- /dev/null
+++ b/lib/Tween.js
@@ -0,0 +1,530 @@
+/**
+ * @author sole / http://soledadpenades.com
+ * @author mr.doob / http://mrdoob.com
+ * @author Robert Eisele / http://www.xarg.org
+ * @author Philippe / http://philippe.elsass.me
+ * @author Robert Penner / http://www.robertpenner.com/easing_terms_of_use.html
+ * @author Paul Lewis / http://www.aerotwist.com/
+ * @author lechecacharro
+ * @author Josh Faul / http://jocafa.com/
+ */
+
+var TWEEN = TWEEN || ( function () {
+
+	var i, tl, interval, time, fps = 60, autostart = false, tweens = [];
+
+	return {
+	
+		setFPS: function ( f ) {
+
+			fps = f || 60;
+
+		},
+
+		start: function ( f ) {
+			
+			if( arguments.length != 0 ) {
+				this.setFPS( f );
+			}
+			
+			interval = setInterval( this.update, 1000 / fps );
+
+		},
+
+		stop: function () {
+
+			clearInterval( interval );
+
+		},
+
+		setAutostart: function ( value ) {
+
+			autostart = value;
+			
+			if(autostart && !interval) {
+				this.start();
+			}
+
+		},
+
+		add: function ( tween ) {
+
+			tweens.push( tween );
+
+			if (autostart && !interval) {
+
+				this.start();
+
+			}
+
+		},
+
+		getAll: function() {
+
+			return tweens;
+
+		},
+
+		removeAll: function() {
+
+			tweens = [];
+
+		},
+
+		remove: function ( tween ) {
+
+			i = tweens.indexOf( tween );
+
+			if ( i !== -1 ) {
+
+				tweens.splice( i, 1 );
+
+			}
+
+		},
+
+		update: function (_time) {
+
+			i = 0; num_tweens = tweens.length;
+			var time = _time || Date.now();
+
+			while ( i < num_tweens ) {
+
+				if ( tweens[ i ].update( time ) ) {
+
+					i++;
+
+				} else {
+
+					tweens.splice( i, 1 );
+					num_tweens--;
+
+				}
+
+			}
+
+			if (num_tweens == 0 && autostart == true) {
+
+				this.stop();
+
+			}
+
+		}
+
+	};
+
+} )();
+
+TWEEN.Tween = function ( object ) {
+
+	var _object = object,
+	_valuesStart = {},
+	_valuesDelta = {},
+	_valuesEnd = {},
+	_duration = 1000,
+	_delayTime = 0,
+	_startTime = null,
+	_easingFunction = TWEEN.Easing.Linear.EaseNone,
+	_chainedTween = null,
+	_onUpdateCallback = null,
+	_onCompleteCallback = null;
+
+	this.to = function ( properties, duration ) {
+
+		if( duration !== null ) {
+
+			_duration = duration;
+
+		}
+
+		for ( var property in properties ) {
+
+			// This prevents the engine from interpolating null values
+			if ( _object[ property ] === null ) {
+
+				continue;
+
+			}
+
+			// The current values are read when the tween starts;
+			// here we only store the final desired values
+			_valuesEnd[ property ] = properties[ property ];
+
+		}
+
+		return this;
+
+	};
+
+	this.start = function (_time) {
+
+		TWEEN.add( this );
+
+		_startTime = _time ? _time + _delayTime : Date.now() + _delayTime;
+
+		for ( var property in _valuesEnd ) {
+
+			// Again, prevent dealing with null values
+			if ( _object[ property ] === null ) {
+
+				continue;
+
+			}
+
+			_valuesStart[ property ] = _object[ property ];
+			_valuesDelta[ property ] = _valuesEnd[ property ] - _object[ property ];
+
+		}
+
+		return this;
+	};
+
+	this.stop = function () {
+
+		TWEEN.remove( this );
+		return this;
+
+	};
+
+	this.delay = function ( amount ) {
+
+		_delayTime = amount;
+		return this;
+
+	};
+
+	this.easing = function ( easing ) {
+
+		_easingFunction = easing;
+		return this;
+
+	};
+
+	this.chain = function ( chainedTween ) {
+
+		_chainedTween = chainedTween;
+
+	};
+
+	this.onUpdate = function ( onUpdateCallback ) {
+
+		_onUpdateCallback = onUpdateCallback;
+		return this;
+
+	};
+
+	this.onComplete = function ( onCompleteCallback ) {
+
+		_onCompleteCallback = onCompleteCallback;
+		return this;
+
+	};
+
+	this.update = function ( time ) {
+
+		var property, elapsed, value;
+
+		if ( time < _startTime ) {
+
+			return true;
+
+		}
+
+		elapsed = ( time - _startTime ) / _duration;
+		elapsed = elapsed > 1 ? 1 : elapsed;
+
+		value = _easingFunction( elapsed );
+
+		for ( property in _valuesDelta ) {
+
+			_object[ property ] = _valuesStart[ property ] + _valuesDelta[ property ] * value;
+
+		}
+
+		if ( _onUpdateCallback !== null ) {
+
+			_onUpdateCallback.call( _object, value );
+
+		}
+
+		if ( elapsed == 1 ) {
+
+			if ( _onCompleteCallback !== null ) {
+
+				_onCompleteCallback.call( _object );
+
+			}
+
+			if ( _chainedTween !== null ) {
+
+				_chainedTween.start();
+
+			}
+
+			return false;
+
+		}
+
+		return true;
+
+	};
+
+	/*
+	this.destroy = function () {
+
+		TWEEN.remove( this );
+
+	};
+	*/
+}
+
+TWEEN.Easing = { Linear: {}, Quadratic: {}, Cubic: {}, Quartic: {}, Quintic: {}, Sinusoidal: {}, Exponential: {}, Circular: {}, Elastic: {}, Back: {}, Bounce: {} };
+
+
+TWEEN.Easing.Linear.EaseNone = function ( k ) {
+
+	return k;
+
+};
+
+//
+
+TWEEN.Easing.Quadratic.EaseIn = function ( k ) {
+
+	return k * k;
+
+};
+
+TWEEN.Easing.Quadratic.EaseOut = function ( k ) {
+
+	return - k * ( k - 2 );
+
+};
+
+TWEEN.Easing.Quadratic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1 ) return 0.5 * k * k;
+	return - 0.5 * ( --k * ( k - 2 ) - 1 );
+
+};
+
+//
+
+TWEEN.Easing.Cubic.EaseIn = function ( k ) {
+
+	return k * k * k;
+
+};
+
+TWEEN.Easing.Cubic.EaseOut = function ( k ) {
+
+	return --k * k * k + 1;
+
+};
+
+TWEEN.Easing.Cubic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k;
+	return 0.5 * ( ( k -= 2 ) * k * k + 2 );
+
+};
+
+//
+
+TWEEN.Easing.Quartic.EaseIn = function ( k ) {
+
+	return k * k * k * k;
+
+};
+
+TWEEN.Easing.Quartic.EaseOut = function ( k ) {
+
+	 return - ( --k * k * k * k - 1 );
+
+}
+
+TWEEN.Easing.Quartic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1) return 0.5 * k * k * k * k;
+	return - 0.5 * ( ( k -= 2 ) * k * k * k - 2 );
+
+};
+
+//
+
+TWEEN.Easing.Quintic.EaseIn = function ( k ) {
+
+	return k * k * k * k * k;
+
+};
+
+TWEEN.Easing.Quintic.EaseOut = function ( k ) {
+
+	return ( k = k - 1 ) * k * k * k * k + 1;
+
+};
+
+TWEEN.Easing.Quintic.EaseInOut = function ( k ) {
+
+	if ( ( k *= 2 ) < 1 ) return 0.5 * k * k * k * k * k;
+	return 0.5 * ( ( k -= 2 ) * k * k * k * k + 2 );
+
+};
+
+// 
+
+TWEEN.Easing.Sinusoidal.EaseIn = function ( k ) {
+
+	return - Math.cos( k * Math.PI / 2 ) + 1;
+
+};
+
+TWEEN.Easing.Sinusoidal.EaseOut = function ( k ) {
+
+	return Math.sin( k * Math.PI / 2 );
+
+};
+
+TWEEN.Easing.Sinusoidal.EaseInOut = function ( k ) {
+
+	return - 0.5 * ( Math.cos( Math.PI * k ) - 1 );
+
+};
+
+//
+
+TWEEN.Easing.Exponential.EaseIn = function ( k ) {
+
+	return k == 0 ? 0 : Math.pow( 2, 10 * ( k - 1 ) );
+
+};
+
+TWEEN.Easing.Exponential.EaseOut = function ( k ) {
+
+	return k == 1 ? 1 : - Math.pow( 2, - 10 * k ) + 1;
+
+};
+
+TWEEN.Easing.Exponential.EaseInOut = function ( k ) {
+
+	if ( k == 0 ) return 0;
+        if ( k == 1 ) return 1;
+        if ( ( k *= 2 ) < 1 ) return 0.5 * Math.pow( 2, 10 * ( k - 1 ) );
+        return 0.5 * ( - Math.pow( 2, - 10 * ( k - 1 ) ) + 2 );
+
+};
+
+// 
+
+TWEEN.Easing.Circular.EaseIn = function ( k ) {
+
+	return - ( Math.sqrt( 1 - k * k ) - 1);
+
+};
+
+TWEEN.Easing.Circular.EaseOut = function ( k ) {
+
+	return Math.sqrt( 1 - --k * k );
+
+};
+
+TWEEN.Easing.Circular.EaseInOut = function ( k ) {
+
+	if ( ( k /= 0.5 ) < 1) return - 0.5 * ( Math.sqrt( 1 - k * k) - 1);
+	return 0.5 * ( Math.sqrt( 1 - ( k -= 2) * k) + 1);
+
+};
+
+//
+
+TWEEN.Easing.Elastic.EaseIn = function( k ) {
+
+	var s, a = 0.1, p = 0.4;
+	if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
+	if ( !a || a < 1 ) { a = 1; s = p / 4; }
+	else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
+	return - ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );
+
+};
+
+TWEEN.Easing.Elastic.EaseOut = function( k ) {
+
+	var s, a = 0.1, p = 0.4;
+	if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
+	if ( !a || a < 1 ) { a = 1; s = p / 4; }
+	else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
+	return ( a * Math.pow( 2, - 10 * k) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) + 1 );
+
+};
+
+TWEEN.Easing.Elastic.EaseInOut = function( k ) {
+
+	var s, a = 0.1, p = 0.4;
+	if ( k == 0 ) return 0; if ( k == 1 ) return 1; if ( !p ) p = 0.3;
+        if ( !a || a < 1 ) { a = 1; s = p / 4; }
+        else s = p / ( 2 * Math.PI ) * Math.asin( 1 / a );
+        if ( ( k *= 2 ) < 1 ) return - 0.5 * ( a * Math.pow( 2, 10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) );
+        return a * Math.pow( 2, -10 * ( k -= 1 ) ) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) * 0.5 + 1;
+
+};
+
+//
+
+TWEEN.Easing.Back.EaseIn = function( k ) {
+
+	var s = 1.70158;
+	return k * k * ( ( s + 1 ) * k - s );
+
+};
+
+TWEEN.Easing.Back.EaseOut = function( k ) {
+
+	var s = 1.70158;
+	return ( k = k - 1 ) * k * ( ( s + 1 ) * k + s ) + 1;
+
+};
+
+TWEEN.Easing.Back.EaseInOut = function( k ) {
+
+	var s = 1.70158 * 1.525;
+	if ( ( k *= 2 ) < 1 ) return 0.5 * ( k * k * ( ( s + 1 ) * k - s ) );
+	return 0.5 * ( ( k -= 2 ) * k * ( ( s + 1 ) * k + s ) + 2 );
+
+};
+
+// 
+
+TWEEN.Easing.Bounce.EaseIn = function( k ) {
+
+	return 1 - TWEEN.Easing.Bounce.EaseOut( 1 - k );
+
+};
+
+TWEEN.Easing.Bounce.EaseOut = function( k ) {
+
+	if ( ( k /= 1 ) < ( 1 / 2.75 ) ) {
+
+		return 7.5625 * k * k;
+
+	} else if ( k < ( 2 / 2.75 ) ) {
+
+		return 7.5625 * ( k -= ( 1.5 / 2.75 ) ) * k + 0.75;
+
+	} else if ( k < ( 2.5 / 2.75 ) ) {
+
+		return 7.5625 * ( k -= ( 2.25 / 2.75 ) ) * k + 0.9375;
+
+	} else {
+
+		return 7.5625 * ( k -= ( 2.625 / 2.75 ) ) * k + 0.984375;
+
+	}
+
+};
+
+TWEEN.Easing.Bounce.EaseInOut = function( k ) {
+
+	if ( k < 0.5 ) return TWEEN.Easing.Bounce.EaseIn( k * 2 ) * 0.5;
+	return TWEEN.Easing.Bounce.EaseOut( k * 2 - 1 ) * 0.5 + 0.5;
+
+};
diff --git a/lib/jquery-1.8.0.min.js b/lib/jquery-1.8.0.min.js
new file mode 100644
index 00000000..f121291c
--- /dev/null
+++ b/lib/jquery-1.8.0.min.js
@@ -0,0 +1,2 @@
+/*! jQuery v@1.8.0 jquery.com | jquery.org/license */
+(function(a,b){function G(a){var b=F[a]={};return p.each(a.split(s),function(a,c){b[c]=!0}),b}function J(a,c,d){if(d===b&&a.nodeType===1){var e="data-"+c.replace(I,"-$1").toLowerCase();d=a.getAttribute(e);if(typeof d=="string"){try{d=d==="true"?!0:d==="false"?!1:d==="null"?null:+d+""===d?+d:H.test(d)?p.parseJSON(d):d}catch(f){}p.data(a,c,d)}else d=b}return d}function K(a){var b;for(b in a){if(b==="data"&&p.isEmptyObject(a[b]))continue;if(b!=="toJSON")return!1}return!0}function ba(){return!1}function bb(){return!0}function bh(a){return!a||!a.parentNode||a.parentNode.nodeType===11}function bi(a,b){do a=a[b];while(a&&a.nodeType!==1);return a}function bj(a,b,c){b=b||0;if(p.isFunction(b))return p.grep(a,function(a,d){var e=!!b.call(a,d,a);return e===c});if(b.nodeType)return p.grep(a,function(a,d){return a===b===c});if(typeof b=="string"){var d=p.grep(a,function(a){return a.nodeType===1});if(be.test(b))return p.filter(b,d,!c);b=p.filter(b,d)}return p.grep(a,function(a,d){return p.inArray(a,b)>=0===c})}function bk(a){var b=bl.split("|"),c=a.createDocumentFragment();if(c.createElement)while(b.length)c.createElement(b.pop());return c}function bC(a,b){return a.getElementsByTagName(b)[0]||a.appendChild(a.ownerDocument.createElement(b))}function bD(a,b){if(b.nodeType!==1||!p.hasData(a))return;var c,d,e,f=p._data(a),g=p._data(b,f),h=f.events;if(h){delete g.handle,g.events={};for(c in h)for(d=0,e=h[c].length;d<e;d++)p.event.add(b,c,h[c][d])}g.data&&(g.data=p.extend({},g.data))}function bE(a,b){var 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diff --git a/lib/rgbcolor.js b/lib/rgbcolor.js
new file mode 100644
index 00000000..773fed81
--- /dev/null
+++ b/lib/rgbcolor.js
@@ -0,0 +1,119 @@
+/**
+ * A class to parse color values
+ * @author Stoyan Stefanov <sstoo@gmail.com>
+ * @link   http://www.phpied.com/rgb-color-parser-in-javascript/
+ * @license Use it if you like it
+ * MODIFICATIONS by Peter Cottle :D
+ */
+function Color(color_string)
+{
+    // if it's an object, just clone and return
+    if (typeof color_string === 'object') {
+      this.r = color_string.r; this.g = color_string.g;
+      this.a = color_string.a; this.b = color_string.b;
+      this.ok = true;
+      return;
+    }
+
+    // strip any leading #
+    if (color_string.charAt(0) == '#') { // remove # if any
+        color_string = color_string.substr(1,6);
+    }
+
+    color_string = color_string.replace(/ /g,'');
+    color_string = color_string.toLowerCase();
+
+   // array of color definition objects
+    var color_defs = [
+        {
+            re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,
+            example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],
+            process: function (bits){
+                return [
+                    parseInt(bits[1]),
+                    parseInt(bits[2]),
+                    parseInt(bits[3])
+                ];
+            }
+        },
+        {
+            re: /^(\w{2})(\w{2})(\w{2})$/,
+            example: ['#00ff00', '336699'],
+            process: function (bits){
+                return [
+                    parseInt(bits[1], 16),
+                    parseInt(bits[2], 16),
+                    parseInt(bits[3], 16)
+                ];
+            }
+        },
+        {
+            re: /^(\w{1})(\w{1})(\w{1})$/,
+            example: ['#fb0', 'f0f'],
+            process: function (bits){
+                return [
+                    parseInt(bits[1] + bits[1], 16),
+                    parseInt(bits[2] + bits[2], 16),
+                    parseInt(bits[3] + bits[3], 16)
+                ];
+            }
+        },
+        {
+            re: /^rgba\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3}),\s*([0-9.]+)\)*$/,
+            example: ['rgba(123, 234, 45, 0.2)', 'rgb(255,234,245,1)'],
+            process: function (bits){
+                return [
+                    parseInt(bits[1]),
+                    parseInt(bits[2]),
+                    parseInt(bits[3]),
+                    parseFloat(bits[4])
+                ];
+            }
+
+        }
+    ];
+
+    var found = false;
+    // search through the definitions to find a match
+    for (var i = 0; i < color_defs.length; i++) {
+        var re = color_defs[i].re;
+        var processor = color_defs[i].process;
+        var bits = re.exec(color_string);
+        if (bits) {
+            channels = processor(bits);
+            this.r = channels[0];
+            this.g = channels[1];
+            this.b = channels[2];
+            this.a = channels[3] || 1;
+            found = true;
+            break;
+        }
+    }
+    if (!found) {
+      throw new Error('Could not parse the color_string ' + JSON.stringify(color_string));
+    }
+
+    // validate/cleanup values
+    this.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r);
+    this.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g);
+    this.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b);
+    this.a = (this.a < 0 || isNaN(this.a)) ? 1 : ((this.a > 1) ? 1 : this.a);
+
+    // some getters
+    this.toRGB = function () {
+        return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';
+    }
+    this.toRGBA = function() {
+        return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ', ' + this.a;
+    }
+
+    this.toHex = function () {
+        var r = this.r.toString(16);
+        var g = this.g.toString(16);
+        var b = this.b.toString(16);
+        if (r.length == 1) r = '0' + r;
+        if (g.length == 1) g = '0' + g;
+        if (b.length == 1) b = '0' + b;
+        return '#' + r + g + b;
+    }
+}
diff --git a/src/.index.html.swp b/src/.index.html.swp
new file mode 100644
index 00000000..86573629
Binary files /dev/null and b/src/.index.html.swp differ
diff --git a/src/index.html b/src/index.html
new file mode 100644
index 00000000..9235e2a0
--- /dev/null
+++ b/src/index.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
+   "http://www.w3.org/TR/html4/strict.dtd">
+
+<html lang="en">
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+  <title>The Art of Presence</title>
+	<meta name="author" content="Christian Swinehart And Peter Cottle">
+	<link rel="stylesheet" href="style/main.css" type="text/css" charset="utf-8">
+</head>
+<body>
+  <canvas id="viewport" width="800" height="600"></canvas>
+
+   <script src="../lib/jquery-1.8.0.min.js"></script>
+   <!-- Include the individual source files so we can extend-->
+   <script src="../arbor_src/etc.js"></script>
+   <script src="../arbor_src/kernel.js"></script>
+   <script src="../arbor_src/graphics/colors.js"></script>
+   <script src="../arbor_src/graphics/primitives.js"></script>
+   <script src="../arbor_src/graphics/graphics.js"></script>
+   <script src="../arbor_src/tween/easing.js"></script>
+   <script src="../arbor_src/tween/tween.js"></script>
+   <script src="../arbor_src/physics/atoms.js"></script>
+   <script src="../arbor_src/physics/barnes-hut.js"></script>
+   <script src="../arbor_src/physics/physics.js"></script>
+   <script src="../arbor_src/physics/system.js"></script>
+   <script src="../arbor_src/dev.js"></script>
+
+  <script src="../lib/Tween.js"></script>
+  <script src="../lib/rgbcolor.js"></script>
+  <script src="../lib/EventEmitter.min.js"></script>
+  <script src="util.js"></script>
+  <script src="mine.js"></script>
+  <script src="legacy.js"></script>
+</body>
+</html>
diff --git a/src/legacy.js b/src/legacy.js
new file mode 100644
index 00000000..b262069e
--- /dev/null
+++ b/src/legacy.js
@@ -0,0 +1,145 @@
+Renderer = function(canvas) {
+  canvas = $(canvas).get(0);
+  var ctx = canvas.getContext("2d");
+  var particleSystem = null;
+  
+  var that = {
+    init: function(system){
+      particleSystem = system;
+      particleSystem.screen({padding:[100, 100, 100, 100],
+                            step:.02});
+     $(window).resize(that.resize);
+     that.resize();
+     that.initMouseHandling();
+    },
+
+    drawNode: function(node, pt) {
+        // node: {mass:#, p:{x,y}, name:"", data:{}}
+        // pt:   {x:#, y:#}  node position in screen coords
+        node.draw(ctx, pt);
+    },
+
+    drawEdge: function(edge, pt1, pt2) {
+        // edge: {source:Node, target:Node, length:#, data:{}}
+        // pt1:  {x:#, y:#}  source position in screen coords
+        // pt2:  {x:#, y:#}  target position in screen coords
+        edge.draw(ctx, pt1, pt2);
+    },
+
+    redraw: function(){
+      if (particleSystem === null) {
+        return;
+      }
+
+      ctx.clearRect(0,0, canvas.width, canvas.height);
+      particleSystem.eachEdge(this.drawEdge);
+      particleSystem.eachNode(this.drawNode);
+    },
+    
+    resize: function(){
+      var w = $(window).width(),
+          h = $(window).height();
+      // resize the canvas element to fill the screen
+      canvas.width = w; canvas.height = h;
+      // inform the system so it can map coords for us
+      particleSystem.screenSize(w,h);
+      that.redraw();
+    },
+
+    initMouseHandling: function(){
+      // no-nonsense drag and drop (thanks springy.js)
+      selected = null;
+      nearest = null;
+      var dragged = null;
+      var oldmass = 1;
+
+      $(canvas).mousedown(function(e){
+        var pos = $(this).offset();
+        var p = {x:e.pageX-pos.left, y:e.pageY-pos.top};
+        selected = nearest = dragged = particleSystem.nearest(p);
+
+        if (selected.node !== null){
+          dragged.node.tempMass = constants.clickDragMass;
+          dragged.node.fixed = true;
+        }
+        return false;
+      });
+
+      $(canvas).mousemove(function(e){
+        var old_nearest = nearest && nearest.node._id;
+        var pos = $(this).offset();
+        var s = {x:e.pageX-pos.left, y:e.pageY-pos.top};
+
+        nearest = particleSystem.nearest(s);
+        if (!nearest) { return; }
+
+        if (dragged !== null && dragged.node !== null) {
+          var p = particleSystem.fromScreen(s);
+          dragged.node.p = {x:p.x, y:p.y};
+          dragged.tempMass = constants.clickDragMass;
+        }
+
+        return false;
+      });
+
+      $(window).bind('mouseup',function(e){
+        if (dragged===null || dragged.node===undefined) return
+        dragged.node.fixed = false;
+        dragged.node.tempMass = constants.baseMass;
+        dragged = null;
+        selected = null;
+        return false;
+      });
+            
+    },
+  }
+  return that;
+}
+
+function makeEdgeAddClosure(sys, node1, node2) {
+  var c = function() {
+    var e = sys.addEdge(node1, node2);
+    if (e) {
+      e.afterConstruct();
+    }
+  };
+  return c;
+}
+
+var Maps = function(elt){
+  sys = arbor.ParticleSystem(4000, 500, 0.5, false, 55, 0.005, 'verlet')
+  sys.renderer = Renderer("#viewport") // our newly created renderer will have its .init() method called shortly by sys...
+
+  // Add some random nodes and edges to the graph!
+  nodes = [];
+  for (var i = 0; i < 15; i++) {
+    var id = randomString(8);
+    var node = sys.addNode(id);
+    node.afterConstruct();
+    nodes.push(node);
+  }
+
+  var randNode = function() {
+    var length = nodes.length;
+    var index = Math.floor(Math.random() * length);
+    return nodes[index];
+  };
+
+  var closures = [];
+  for (var i = 0; i < 20; i++) {
+    var node1 = randNode();
+    var node2 = randNode();
+    // lol will it ever end?
+    while (node1 === node2) {
+      node2 = randNode();
+    }
+    engine.addEdge(node1, node2);
+  }
+  for (var i = 0; i < nodes.length; i++) {
+    var node2 = randNode();
+    while (nodes[i] === node2) {
+      node2 = randNode();
+    }
+    engine.addEdge(nodes[i], node2);
+  }
+}
diff --git a/src/mine.js b/src/mine.js
new file mode 100644
index 00000000..1e59f740
--- /dev/null
+++ b/src/mine.js
@@ -0,0 +1,261 @@
+
+/**
+ * Globals
+ */
+var ee = null;
+var sys = null;
+var engine = null;
+var graphicsEffects = {};
+
+$(document).ready(function(){
+  engine = new Engine();
+  ee = new EventEmitter();
+
+  var mcp = Maps("#maps");
+
+  var repulsionBreathe = function(r) {
+    sys.parameters({repulsion: r});
+  };
+  var b = new Breather(repulsionBreathe, 6050, 4000);
+
+  graphicsEffects.edgeStrokeEffect = new GraphicsEffect('edgeStroke', {wait: 1000});
+});
+/**
+ * Extend the Arbiter classes below with my own custom functionality to
+ * stop this horrible object cross link stuff
+ */
+Node.prototype.afterConstruct = function() {
+  this.positions = [];
+};
+
+Node.prototype.draw = function(ctx, pt) {
+  this.drawCircleNode(ctx, pt);
+};
+
+Node.prototype.drawCircleNode = function(ctx, pt) {
+  ctx.strokeStyle = graphics.nodeEdge;
+  ctx.lineWidth = graphics.nodeStrokeWidth;
+  ctx.fillStyle = graphics.nodeFill;
+
+  ctx.beginPath();
+  ctx.arc(pt.x, pt.y, 10, 0, Math.PI*2, true);
+  ctx.closePath();
+  ctx.stroke();
+  ctx.fill();
+
+};
+
+/**
+ * Edge
+ */
+Edge.prototype.afterConstruct = function() {
+  //this.pastEdges = [];
+};
+
+Edge.prototype.draw = function(ctx, pt1, pt2) {
+   this.drawLine(ctx, pt1, pt2); 
+};
+
+Edge.prototype.drawLine = function(ctx, pt1, pt2, opacityPercent) {
+  var color = new Color(graphics.edgeStroke);
+  color.a = color.a * (opacityPercent === undefined ? 1 : opacityPercent);
+
+  ctx.lineWidth = graphics.edgeWidth + 1;
+  ctx.strokeStyle = color.toRGBA();
+  ctx.fillStyle = null;
+
+  ctx.beginPath();
+  ctx.moveTo(pt1.x, pt1.y);
+  ctx.lineTo(pt2.x, pt2.y);
+  ctx.stroke();
+};
+
+
+function GraphicsEffect(gKey, options) {
+  this.baseColor = graphics[gKey];
+
+  this.closure = (function(base_color) {
+    var oSetter = function(o) {
+      var color = new Color(base_color);
+      color.a *= o;
+      graphics[gKey] = color.toRGBA();
+    };
+    return oSetter;
+  })(this.baseColor);
+
+  this.breather = new Breather(
+    this.closure,
+    options.midpoint || 0.9,
+    options.amp || 0.85,
+    options.period || 0.1,
+    options.wait || 0
+  );
+}
+
+GraphicsEffect.prototype.pause = function() {
+  this.breather.stop();
+};
+
+GraphicsEffect.prototype.resume = function() {
+  this.breather.next();
+};
+
+/**
+ * Breather
+ */
+function Breather(closure, baseline, delta, period, wait) {
+  this.delta = delta;
+  this.baseline = baseline;
+  this.closure = closure;
+
+  this.t = 0;
+  this.interval = 1/40 * 1000; // 40fps
+
+  var period_in_seconds = period || time.breathePeriod;
+  this.period = 2 * Math.PI * 1000 * period_in_seconds;
+
+  this.interpolationFunction = TWEEN.Easing.Wave.Triangle;
+
+  if (wait) {
+    var _this = this;
+    setTimeout(function() {
+      _this.start();
+    }, wait);
+  } else {
+    this.start();
+  }
+}
+
+Breather.prototype.start = function() {
+  this.t = 0;
+  this.next();
+};
+
+Breather.prototype.next = function() {
+  var _this = this;
+  this.timeout = setTimeout(function() {
+    _this.breathe();
+  }, this.interval);
+};
+
+Breather.prototype.stop = function() {
+  clearTimeout(this.timeout);
+};
+
+Breather.prototype.breathe = function() {
+  this.t += this.interval;
+
+  var value = Math.sin(this.t / this.period) * this.delta + this.baseline;
+  this.closure(value);
+
+  this.next();
+};
+
+/**
+ * Particle System Engine
+ *
+ * Handles async stuff like adding the edges, etc
+ */
+function Engine() {
+  this.addEdgeTimeout = null;
+  this.edgeClosures = [];
+}
+
+Engine.prototype.addEdge = function(node1, node2) {
+  this.touchEdgeTimer();
+
+  this.edgeClosures.push(this.edgeClosureFactory(node1, node2));
+};
+
+Engine.prototype.edgeClosureFactory = function(node1, node2) {
+  var c = function() {
+    var e = sys.addEdge(node1, node2);
+    if (e) {
+      e.afterConstruct();
+    }
+  };
+  return c;
+};
+
+Engine.prototype.touchEdgeTimer = function(key) {
+  if (this.addEdgeTimeout) {
+    return;
+  }
+
+  var _this = this;
+  this.addEdgeTimeout = setTimeout(function() {
+    _this.startEdgeScheduler();
+  }, 100);
+};
+
+Engine.prototype.startEdgeScheduler = function() {
+  // start scheduler
+  var s = new Scheduler(this.edgeClosures, time.edgeAddInterval, 'add_edge');
+  s.start();
+
+  this.resetEdges();
+};
+
+Engine.prototype.resetEdges = function() {
+  this.edgeClosures = [];
+  this.addEdgeTimeout = null;
+};
+
+/**
+ * Cover Photo
+ */
+function CoverPhoto(id, profile_pic_src, cover_photo_src) {
+  this.pp_src = profile_pic_src;
+  this.cp_src = cover_photo_src;
+  this.profile_id = id;
+
+  // this is where I _should_ use templating... but i wont :P
+  this.html = '' +
+  '<div id="' + id + 'coverphoto" class="coverPhotoWrapper">' +
+    '<div class="coverPhotoDiv">' +
+      '<img src="' + this.cp_src + '"/>' +
+    '</div>' +
+  '</div>' +
+  '<div id="' + id + 'profilepic" class="profilePicCenter">' + 
+    '<div class="profilePicDiv">' +
+      '<img src="' + this.pp_src + '"/>' +
+    '</div>' +
+  '</div>'
+  ;
+
+  $('body').append(this.html);
+  this.cp_node = $('#' + id + 'coverphoto')[0];
+  this.pp_node = $('#' + id + 'profilepic')[0];
+};
+
+CoverPhoto.prototype.show = function() {
+  var _this = this;
+  // let it get drawn first so it animates
+  setTimeout(function() {
+    _this.toggleShow(true);
+  }, 10);
+};
+
+CoverPhoto.prototype.hide = function() {
+  this.toggleShow(false);
+};
+
+CoverPhoto.prototype.toggle = function() {
+  $(this.cp_node).toggleClass('visible');
+  $(this.pp_node).toggleClass('visible');
+};
+
+CoverPhoto.prototype.toggleShow = function(bool) {
+  $(this.cp_node).toggleClass('visible', bool);
+  $(this.pp_node).toggleClass('visible', bool);
+};
+
+var profile_pic_src = 'https://fbcdn-profile-a.akamaihd.net/hprofile-ak-ash2/368844_545515979_1956877679_n.jpg';
+var cover_photo_src = 'https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-ash3/c0.0.851.315/p851x315/564389_10150741774845980_1149055874_n.jpg';
+var c = new CoverPhoto('pcottle', profile_pic_src, cover_photo_src);
+
+c.show();
+setTimeout(function() {
+  c.hide();
+}, 2000);
+
diff --git a/src/util.js b/src/util.js
new file mode 100644
index 00000000..024abc74
--- /dev/null
+++ b/src/util.js
@@ -0,0 +1,94 @@
+/**
+ * Util classes
+ */
+
+function Scheduler(closures, interval, type) {
+  if (!closures || !closures.length || !interval || !type) {
+    throw new Error('invalid params');
+  }
+
+  this.done = false;
+  this.closures = closures;
+  this.interval = interval;
+  this.type = type;
+  this.timeOut = null;
+  this.index = 0;
+
+  ee.addListener('scheduler_stop', this.stopSchedule, this);
+}
+
+Scheduler.prototype.start = function() {
+  // set the first interval
+  this.index = 0;
+  this.done = false;
+  this.setNext();
+};
+
+Scheduler.prototype.setNext = function(interval) {
+  var _this = this;
+  this.timeOut = setTimeout(function() {
+    _this.step();
+  }, interval || this.interval);
+};
+
+Scheduler.prototype.stopSchedule = function(type) {
+  console.log('received event signal');
+  if (type == 'all' || type == this.type) {
+    // either of these should work...
+    this.done = true;
+    clearTimeout(this.timeOut);
+  }
+};
+
+Scheduler.prototype.step = function() {
+  if (this.done) {
+    return;
+  }
+
+  //console.log(this.type + ' is stepping with index ' + this.index);
+  var results = this.closures[this.index]() || {};
+  this.index++;
+
+  if (results.done || this.index >= this.closures.length) {
+    this.done = true;
+    return;
+  }
+  this.setNext(results.interval);
+};
+
+/**
+ * Constants....!!!
+ */
+var constants = {
+  clickDragMass: 20,
+  baseMass: 1,
+};
+
+var time = {
+  edgeAddInterval: 200,
+  breathePeriod: 0.3
+};
+
+/**
+ * Graphics style
+ */
+var graphics = {
+  // colors
+  edgeStroke: 'rgba(94%, 96%, 98%, 0.5)', // '#EFF5FB',
+  nodeEdge: 'rgba(94%, 96%, 98%, 0.9)', // '#EFF5FB',
+  nodeFill: '#0066cc',
+
+  // widths
+  nodeStrokeWidth: 15,
+  edgeWidth: 2,
+};
+
+function randomString(string_length) {
+  var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
+  var randomstring = '';
+  for (var i=0; i<string_length; i++) {
+    var rnum = Math.floor(Math.random() * chars.length);
+    randomstring += chars.substring(rnum,rnum+1);
+  }
+  return randomstring;
+}