This model showcases that 3 times three sided, same-volume-pyramids are half of a Parallelepiped.
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![Spat / Parallelflach / Parallelepiped [math geometry model] 3D model preview](https://media.printables.com/media/prints/84811/images/902825_3492d1ad-3b8a-4310-ab91-a744bb156365/tempimagelgtbck.jpg)