Some Irregular 4d Polytope Foldouts
Tetrahedral Bipyramid Icosahedral Bipyramid

These two figures are the only irregular convex deltatopes in 4 dimensions.
The regular convex deltatopes are the 4-simplex, 16-cell, and 600-cell, which appear on the previous page.
A "Deltatope" is an n-dimensional polytope whose n-1 dimensional facets are all (n-1)-simplexes.

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