Regular solids and DISCRETA:
The Tetrahedron and its derivatives

Tetrahedron (selfdual!)

Considering the midpoints of edges of the tetrahedron leads to the octahedron! So the only interesting modification is truncating the tetrahedron:

truncated tetrahedron

doubly truncated tetrahedron

midpoints of edges of truncated tetrahedron

dual of the truncated tetrahedron

We also have a sensitive map of these and other relations.

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Last updated: August 6, 1999, Evi Haberberger