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

    "ball":
    {
      "r":   75,
      "x":   75,
      "y":   75,
      "vx": 400,
      "vy": 300,
      "ax": 200,
      "ay": 100
    }
  },

  "view":
  {
    "ball":
    {
      "border":      5,
      "borderColor": { "@color": "#AAAAAA" },
      "color":       { "@color": "#FFAA00" }
    }
  }
}