[
  {
    "type" : "ClutterRectangle",
    "id" : "rect",
    "width" : 100,
    "height" : 100
  },
  {
    "type" : "ClutterState",
    "id" : "state",

    "transitions" : [
      {
        "source" : "base",
        "target" : "clicked",
        "duration" : 250,

        "keys" : [
          [ "rect", "opacity", "linear", 128 ]
        ]
      },
      {
        "source" : "clicked",
        "target" : "base",
        "duration" : 150,

        "keys" : [
          [ "rect", "opacity", "linear", 255 ]
        ]
      }
    ]
  }
]