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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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.
RobertLovesPi.net 
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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