the ellipsograph (or Archimedes’ net)
look closely, you can see that each ball moves in a straight line.
https://i.poastcdn.org/63ecb8aa70e5d4e1e627d86e6655a8dde03903f2cc4a287736eab4f9807a6e9b.mp4
nostr:npub1ku8y90c3zzc0naz76z7fhakw46r9kvxsufzzf8mlzwdqx43x6s9sla8cga That's so cool
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