How to make a hollow geodesic plywood ball
https://boingboing.net/2018/11/21/how-to-make-a-hollow-geodesic.html

I don't actually care about the how-to part of the linked video, but the malachite-like patterns that emerge from the plywood layers on the resulting ball are quite pretty. If you think about it, it's reversed from actual malachite, where the 3d structure involves nested spheres, and you get the patterns from a flat cut. Here, the 3d structure involves flat layers, and you get the patterns from a spherical cut.
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