[
    {
        "id": "bush1",
        "primitive": "instance",
        "entity": "bush2"
    },
    {
        "id": "bush2",
        "primitive": "instance",
        "entity": "bush3"
    },
    {
        "id": "bush3",
        "primitive": "instance",
        "entity": "bush1"
    },
    {
        "id": "plants",
        "primitive": "layer",
        "color": [0,1,0],
        "elements": ["bush1", "bush"]
    }
]