[
    {
        "entities": [{"origin": [3,0,0],"primitive": "sphere","radius": 3}],
        "id": "a","primitive": "geometryList"
    },
    {
        "id":"b",
        "primitive":"instance",
        "entity":"a"
    },
    {
        "elements": ["b"],
        "id": "c",
        "primitive": "layer"
    }
]