-This draws sets of turning, interlocking gears, rotating in three
-dimensions. Another GL hack, by Danny Sung, Brian Paul, Ed Mackey,
-and Jamie Zawinski.
+Interlocking gears. See also the "Pinion" and "MoebiusGears" screen savers.
+
+https://en.wikipedia.org/wiki/Involute_gear
+https://en.wikipedia.org/wiki/Epicyclic_gearing
+
+Written by Jamie Zawinski; 2007.