visualize the rotation, it uses a different color for the edges of
each face. Don't think about it too long, or your brain will melt.
-http://en.wikipedia.org/wiki/Hypercube
-http://en.wikipedia.org/wiki/Tesseract
-http://en.wikipedia.org/wiki/Regular_polytope
+https://en.wikipedia.org/wiki/Hypercube
+https://en.wikipedia.org/wiki/Tesseract
+https://en.wikipedia.org/wiki/Regular_polytope
Written by Joe Keane, Fritz Mueller, and Jamie Zawinski; 1992.
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