I love the rotary-plotting sand pits. They use a magnetically coupled ball to trace patterns in sand or similar. It is like automating a Zen garden if such a thing were desirable. When I saw Sisyphish, which traces lines in a fish tank's bottom, I thought it was pretty cool, and I learned about the Rho-Theta coordinate system.
You can find all my Hackaday articles on my Hackaday author page.
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