Each of these has a tetrahedron hidden from view in the center.

These were made using* Stella 4d*, which you may try for yourself here.

Each of these has a tetrahedron hidden from view in the center.

These were made using* Stella 4d*, which you may try for yourself here.

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The first one is interesting: if remove yellow triangles and leave only red hexagons, it forms one polyhedron, which can be extended infinitely in all directions, forming a periodic regular polyhedron. Each its face is regular hexagon and at each vertex meet 6 hexagons. So its dual polyhedron is the same periodic infinite polyhedron!

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