(
    [
        (
            specifier: "world.structure.natural.ribcage-small",
            center: (7, 13, 4)
        ),
        (
            specifier: "world.structure.natural.ribcage-large",
            center: (13, 19, 8)
        ),
        (
            specifier: "world.structure.natural.skull-large",
            center: (15, 20, 4)
        ),
    ]
)