{ "model":
  { "stage":
    { "left":   0,
      "right":  500,
      "top":    0,
      "bottom": 500
    },

    "ball":
    { "r":   75,
      "x":   75,
      "y":   75,
      "vx": 400,
      "vy": 300
    }
  },

  "view":
  { "ball":
    { "border":      10,
      "borderColor": "#000000",
      "color":       "#00AAFF"
    }
  }
}