-Draws a closed, interlinked chain of rotating gears. The layout of
-the gears follows the path of a moebius strip.
+An interlinked loop of rotating gears. The layout of the gears
+follows the path of a moebius strip. See also the "Pinion" and
+"Gears" screen savers.
+
+https://en.wikipedia.org/wiki/Involute_gear
+https://en.wikipedia.org/wiki/Moebius_strip