anchor.diff:    var Model = Base.extend({
       model_id: 0,
       model_type: "",
  -    initialize: function(model_obj, position, max_speed, max_force)  {
  +    initialize: function(model_obj, position, max_speed, max_force, color)  {
         this.model_id = model_obj.id;
         this.model_type = model_obj.model;
         
  
positive.code:   var audit_list = {};
    //list of model objects that have veen converted for paperscript
    var model_list = new Array();
  
    function find_or_create_model(new_model)  {
      for(var i = 0; i < model_list.length; i++)  {
  
negative.code: 
        this.shape = new Path.Circle(this.loc, this.radius);
        this.shape.strokeColor = "white";
        this.shape.fillColor = color;
  
        this.title_text = new PointText(this.loc);
        this.title_text.paragraphStyle.justification = 'center';
        this.title_text.characterStyle.fontSize = 10;
        this.title_text.fillColor = 'white';
        this.title_text.content = this.model_type + ": " + this.model_id;
  
        this.connections = new Array;
      },
  