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

    "birds":
    [ { "view": "tux", "r":  25, "x": 100, "y":  50, "vx": 200, "vy":  17,
        "ax": 200, "ay": 100
      },
      { "view": "owl", "r":  25, "x": 150, "y": 150, "vx": 100, "vy": 217 },
      { "view": "tux", "r":  25, "x": 200, "y": 250, "vx": 250, "vy": 117 },
      { "view": "owl", "r":  25, "x":  50, "y": 100, "vx": 200, "vy": 213 },
      { "view": "tux", "r":  25, "x": 300, "y": 400, "vx": 202, "vy": 100 }
    ]
  },

  "view":
  { "stage": { "resource": "background" },
    "owl":   { "resource": "owl", "r": "@birdRadius" },
    "tux":   { "resource": "tux", "r": "@birdRadius" }
  }
}