{
  "model":
  {
    "stage":
    {
      "width":  "@width",
      "height": "@height",
      "border": 50
    },

    "ball":
    {
      "r":  25,
      "x":  25,
      "y":  25,
      "vx": 400,
      "vy": 300
    }
  },

  "view":
  {
    "ball":
    {
      "border":      3,
      "borderColor": { "@color": "#AAAAAA" },
      "color":       { "@color": "#00AAFF" }
    }
  }
}