I love that toy, and it's not really a toy. Spirograph lets you inscribe creative circles with an elegant weave with a gear-type set up. Hmm, bad explanation, but it's still a cool toy. Google it for heaven's sake.
While your search is running, ponder the idea of ellipses instead of circles for the Spirograph. Then the idea of each planet getting it's own elliptical gear, and you'll have a cool science project that doubles as an art project. Might just try this one myself...
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