text: function createBox (width, height, color) {
    width = (width === undefined) ? 50 : width;
    height = (height === undefined) ? 50 : height;
    color = color || "#ff0000";
    return doodle.createSprite(function () {
      this.vx = 0;
      this.vy = 0;
      
      this.graphics.beginFill(color);
      this.graphics.rect(-width/2, -height/2, width, height);
      this.graphics.endFill();
    });
  }
  