Convex polyhedra bounded entirely by centrally-symmetrical polygons are
zonohedra, and zonohedra determined by an integer "n" (n>=3) vectors disposed
like equally-spaced generators of a right cone are polar zonohedra. I made a
macro which constructs polar zonohedra in POV itself; it allows one to display
either the n*(n-1) rhombic faces, or the edges and vertices, as cylinders and
spheres; or all. In this case, only the edges and vertices are shown. This
(n=20, I think) polar zonohedron has a light source within it, and is itself
within a large sphere, along with another smaller sphere, and rests upon a
plane which for some reason has an old map of Calfornia's Sierra Nevada mapped
onto it ...

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