[
 {"height": 10, "size": 6, "velocity": 4},
 {"height": 13, "size": 3, "velocity": 2},
 {"height": 17, "size": 6, "velocity": 3},
 {"height": 21, "size": 8, "velocity": 4},
 {"height": 19, "size": 5, "velocity": 3},
 {"height": 18, "size": 4, "velocity": 4}
]