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Module: A Quanta Module:
"There are very few tetrahedra that can be folded out of one whole triangle… This is an extremely rare strange one; and this one particular asymmetrical tetrahedron can be folded out of one asymmetrical triangle. I haven’t found any other asymmetrical triangle that can be folded into any kind of tetrahedron: the vertexes refuse to come together on a piece of paper. This is a very special case and the only other one is the whole equilateral triangle that makes the regular tetrahedron.
“They are very interesting, because the bounce lines-- we know we have reflections into mirrors, and so forth, and lines bounce off at the same angle as they come in-- so when we are bisecting the edges of an equilateral triangle and interconnecting those points with lines, we get the lines on which light would bounce around on the inside of an equilateral triangle if its edges were mirrors. We also get the same thing going on inside this one; but light will bounce out where it comes in at 90 degrees. However, light bouncing around any given triangle (always remember that any triangle, if you bisect its edges and interconnect the points you get similar triangles and they will give you similar angles) and energy lines getting inside a triangle,”
