Cardano's hypocycloid optical illusion.
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Previously:
https://www.homemadetools.net/forum/...946#post232856
https://www.homemadetools.net/forum/...632#post223136
https://www.homemadetools.net/forum/...525#post222811
https://www.homemadetools.net/forum/...011#post221078
https://www.homemadetools.net/forum/...121#post214414
