https://tywkiwdbi.blogspot.com/2018/04/a-mechanical-model-of-cardanos.html
TYWKIWDBI ("Tai-Wiki-Widbee"): A mechanical model of Cardano's Hypocycloid
YouTube link . I've seen animations of hypocycloids before, but not a working model. Most interesting. Found at The Awesomer , via Ne...
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