Node {
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            label: "Tenth",
            item: Rect {
                low: Point3D {
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                    y: 0.0,
                    z: 2.0,
                },
                high: Point3D {
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                    y: 10.0,
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        Leaf {
            label: "Twelfth",
            item: Rect {
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                },
                high: Point3D {
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        Leaf {
            label: "Eleventh",
            item: Rect {
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                },
                high: Point3D {
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    level: 0,
    min_children: 2,
    max_children: 4,
    split_strat: Quadratic,
}