[math-fun] Nested polyhedral puzzle

A retired physicist named Wayne Daniel has created a 3D puzzle in the shape of an icosahedron, that -- as you peel off some of its pieces -- can become a dodecahedron, then an octahedron, then a cube, then a tetrahedron (all regular). See <http://www.nytimes.com/2005/05/10/science/10puzz.html>. (The article is available free through May 16; it requires signing up with your e-address and a password of your choice; you will not get any e-mail as a result, as long as you check that preference.) In hand-scuptured specialty woods, one of these puzzles is a mere $400. (So I'm hoping that Thane -- as a nice gesture -- will spring for one copy for each old-time math-funner. Just an idea. . .) --Dan