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Spirex is based on the geometry of a Spirograph, only with continuously varying wheel sizes. In a fit of nostalgia I ported it to Java many years later. Due to popular demand I rewrote it in C++ and turned it into a Windows and Macintosh screen saver, adding many features along the way.
Check out a sample movie of the screensaver, pretty cool:
http://www.ozonehouse.com/Spirex/movie.html
from http://www.all4you.dk/FreewareWorld/links.php