follows the path of a moebius strip. See also the "Pinion" and
"Gears" screen savers.
-http://en.wikipedia.org/wiki/Involute_gear
-http://en.wikipedia.org/wiki/Moebius_strip
+https://en.wikipedia.org/wiki/Involute_gear
+https://en.wikipedia.org/wiki/Moebius_strip
Written by Jamie Zawinski; 2007.
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