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They are used to make cool looking geometry
patterns, fun and shadows :-)

This is where I found these, not sure of the metal, says
die-cast and they are not magnetic like the tin box.
Spirograph Diecast Collector's Playset

This are what is next on the list ;-)
Wild Gears
Mega hyper spiro's lol

Here is a cool video showing both spirograph
and wild gears.


Source

And wow on the Spirograph Art!

This is so cool! As a mechanical engineer everything related to gears fascinate me. They resemble to watch gears.

Gears and how things work and tick also interest me.
I was amazed when seeing some gears going way
back in time. Like the long count calendar reminds
me of gears or cogs. Patterns of time :-)

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