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

  "balls":
  [
    {
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      "img":    "owl",
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      "ax":     0,
      "ay":     { "@min": 300,   "@max": 600}
    },
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      "img":    "tux",
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      "x":      { "@min": 0.6,  "@max": 0.9,  "@relative": "horizontal" },
      "y":      { "@min": 0.85, "@max": 0.95, "@relative": "vertical" },
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      "vy":     { "@min": -600, "@max": -300 },
      "ax":     0,
      "ay":     { "@min": 300,  "@max": 600 }
    }
  ]
}