diff --git a/arbor_src/dev.js b/arbor_src/dev.js
deleted file mode 100644
index 0316640e..00000000
--- a/arbor_src/dev.js
+++ /dev/null
@@ -1,56 +0,0 @@
-//
-// 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 $.extend but non-destructive
-      uniq:uniq,                // ƒ(arr) -> array of unique items in arr
-      arbor_path:arbor_path,    // ƒ() -> guess the directory of the lib code
-    }
-  })
-
-  
-})()
-
diff --git a/arbor_src/etc.js b/arbor_src/etc.js
deleted file mode 100644
index 2d6815cd..00000000
--- a/arbor_src/etc.js
+++ /dev/null
@@ -1,160 +0,0 @@
-//
-// etc.js
-//
-// misc utilities
-//
-
-  var trace = function(msg){
-    if (typeof(window)=='undefined' || !window.console) return
-    var len = arguments.length
-    var args = []
-    for (var i=0; i<len; i++) args.push("arguments["+i+"]")
-    eval("console.log("+args.join(",")+")")
-  }  
-
-  var dirname = function(path){
-    var pth = path.replace(/^\/?(.*?)\/?$/,"$1").split('/')
-    pth.pop()
-    return "/"+pth.join("/")
-  }
-  var basename = function(path){
-    // var pth = path.replace(/^\//,'').split('/')
-    var pth = path.replace(/^\/?(.*?)\/?$/,"$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
deleted file mode 100644
index 5ec21c32..00000000
--- a/arbor_src/graphics/colors.js
+++ /dev/null
@@ -1,156 +0,0 @@
-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
deleted file mode 100644
index 285b0568..00000000
--- a/arbor_src/graphics/graphics.js
+++ /dev/null
@@ -1,384 +0,0 @@
-//
-//  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
deleted file mode 100644
index a7afad3d..00000000
--- a/arbor_src/graphics/primitives.js
+++ /dev/null
@@ -1,252 +0,0 @@
-//
-//  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)
-    //     // $.each('face size alignment baseline color'.split(" "), function(i, param){
-    //     //   if (params[param]!==undefined){
-    //     //     if (param=='color') _fontStyle[param] = Colors.decode(params[param])
-    //     //     else _fontStyle[param] = params[param]
-    //     //   }
-    //     // })
-    // 
-    //     // ctx.textAlign = _fontStyle.alignment
-    //     // ctx.textBaseline = _fontStyle.baseline
-    //     ctx.font = nano("{size}px {face}", {face:face, size:size})
-    //     // trace(ctx.font,face,size)      
-    //     // ctx.fillStyle = Colors.encode(_fontStyle)
-    //     // _fontStyle = {face:face, size:size, alignment:opts.alignment, baseline:opts.baseline, color:opts.color}
-    //   },
-    //   use:function(){
-    //     ctx.font = nano("{size}px {face}", this)
-    //   }
-    // }
-    // 
-    // 
-
-  ///MACRO:primitives-end
-
-  
-
-
-
-
-
-
-  return {
-    _Oval:_Oval,
-    _Rect:_Rect,
-    _Color:_Color,
-    _Path:_Path
-    // _Frame:Frame
-  }
-}
\ No newline at end of file
diff --git a/arbor_src/hermetic.js b/arbor_src/hermetic.js
deleted file mode 100644
index c3a8835f..00000000
--- a/arbor_src/hermetic.js
+++ /dev/null
@@ -1,48 +0,0 @@
-//
-// hermetic.js
-//
-// the parts of jquery i can't live without (e.g., while in a web worker)
-//
-$ = {
-  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
deleted file mode 100644
index ffaa682c..00000000
--- a/arbor_src/kernel.js
+++ /dev/null
@@ -1,237 +0,0 @@
-//
-// 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
deleted file mode 100644
index 7cbff491..00000000
--- a/arbor_src/physics/atoms.js
+++ /dev/null
@@ -1,95 +0,0 @@
-//
-// 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
deleted file mode 100644
index 9d593dad..00000000
--- a/arbor_src/physics/barnes-hut.js
+++ /dev/null
@@ -1,173 +0,0 @@
-//
-//  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
deleted file mode 100644
index 75622ebd..00000000
--- a/arbor_src/physics/physics.js
+++ /dev/null
@@ -1,362 +0,0 @@
-//
-// 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
deleted file mode 100644
index 5626f0af..00000000
--- a/arbor_src/physics/system.js
+++ /dev/null
@@ -1,620 +0,0 @@
-//
-// 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
-  }
-  
diff --git a/arbor_src/physics/worker.js b/arbor_src/physics/worker.js
deleted file mode 100644
index 0a5a2c80..00000000
--- a/arbor_src/physics/worker.js
+++ /dev/null
@@ -1,157 +0,0 @@
-//
-// 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
deleted file mode 100644
index ab7e52b3..00000000
--- a/arbor_src/tween/easing.js
+++ /dev/null
@@ -1,171 +0,0 @@
-//
-// 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
deleted file mode 100644
index 96b7115f..00000000
--- a/arbor_src/tween/tween.js
+++ /dev/null
@@ -1,175 +0,0 @@
-//
-// 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
deleted file mode 100644
index 6e2ee675..00000000
--- a/lib/EventEmitter.min.js
+++ /dev/null
@@ -1,7 +0,0 @@
-/**
- * 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/rgbcolor.js b/lib/rgbcolor.js
deleted file mode 100644
index 61cc75df..00000000
--- a/lib/rgbcolor.js
+++ /dev/null
@@ -1,133 +0,0 @@
-/**
- * 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)', 'rgba(255,234,245,1)'],
-            process: function (bits){
-                return [
-                    parseInt(bits[1]),
-                    parseInt(bits[2]),
-                    parseInt(bits[3]),
-                    parseFloat(bits[4])
-                ];
-            }
-        },
-        {
-            re: /^rgba\((\d{1,3})%,\s*(\d{1,3})%,\s*(\d{1,3})%,\s*([0-9.]+)\)*$/,
-            example: ['rgba(100%, 97%, 45%, 0.2)', 'rgba(1%,4%,245%,1)'],
-            process: function (bits){
-                var parseRound = function(bit) {
-                  return Math.round((parseInt(bit) / 100) * 256);
-                };
-                return [
-                    parseRound(bits[1]),
-                    parseRound(bits[2]),
-                    parseRound(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 'rgba(' + 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/collections.js b/src/collections.js
index 3413642c..27443689 100644
--- a/src/collections.js
+++ b/src/collections.js
@@ -20,7 +20,6 @@ var CommandBuffer = Backbone.Model.extend({
 
     this.buffer = [];
     this.timeout = null;
-    this.delay = TIME.betweenCommandsDelay;
   },
 
   addCommand: function(command) {
@@ -43,7 +42,7 @@ var CommandBuffer = Backbone.Model.extend({
   setTimeout: function() {
     this.timeout = setTimeout(_.bind(function() {
         this.sipFromBuffer();
-    }, this), this.delay);
+    }, this), TIME.betweenCommandsDelay);
   },
 
   popAndProcess: function() {
diff --git a/src/index.html b/src/index.html
index f219d713..2fce8ee8 100644
--- a/src/index.html
+++ b/src/index.html
@@ -23,22 +23,8 @@
   </div>
 
   <script src="../lib/jquery-1.8.0.min.js"></script>
-  <!-- Include the individual arbor 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/underscore-min.js"></script>
   <script src="../lib/backbone-min.js"></script>
 
diff --git a/src/legacy.js b/src/legacy.js
deleted file mode 100644
index fd30661b..00000000
--- a/src/legacy.js
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * this code is adapted from the excellent ArborJS tutorial by
- * Samizdat Drafting Co
- */
-
-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;
-      }
-
-      events.trigger('fixNodePositions', particleSystem);
-
-      ctx.clearRect(0,0, canvas.width, canvas.height);
-      particleSystem.eachEdge(this.drawEdge);
-      particleSystem.eachNode(this.drawNode);
-
-      events.trigger('drawGitVisuals', particleSystem, ctx, canvas);
-    },
-    
-    resize: function(){
-      var w = $(canvas).width(),
-          h = $(canvas).height();
-      // resize the canvas element to fill the screen TODO -- fix this
-      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 && 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;
-}
-
diff --git a/src/mine.js b/src/mine.js
index fe945bfa..03bdaec9 100644
--- a/src/mine.js
+++ b/src/mine.js
@@ -3,9 +3,6 @@
  */
 var events = _.clone(Backbone.Events);
 
-var sys = null;
-var graphicsEffects = {};
-
 var gitEngine = null;
 var gitVisuals = null;
 
@@ -44,46 +41,3 @@ $(document).ready(function(){
   $('#commandTextField').focus();
 });
 
-
-/**
- * Extend the Arbiter classes below with my own custom functionality.
- */
-
-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;
-  var radius = graphics.nodeRadius;
-
-  ctx.beginPath();
-  ctx.arc(pt.x, pt.y, radius, 0, Math.PI*2, true);
-  ctx.closePath();
-  ctx.stroke();
-  ctx.fill();
-};
-
-/**
- * Edge
- */
-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();
-};
-