[
  {
    "id" : "actor-1",
    "type" : "ClutterActor",
    "margin" : [ 10 ]
  },
  {
    "id" : "actor-2",
    "type" : "ClutterActor",
    "margin" : [ 10, 20 ]
  },
  {
    "id" : "actor-3",
    "type" : "ClutterActor",
    "margin" : [ 10, 20, 30 ]
  },
  {
    "id" : "actor-4",
    "type" : "ClutterActor",
    "margin" : [ 10, 20, 30, 40]
  }
]