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Yeah, The Cicada Principle[0] is a really neat trick. I remember it doing the rounds in web design circles back in the early 2010's

https://web.archive.org/web/20131201024352/http://www.sitepo...

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It looks nice in a lot of design contexts. I made a spinning progress indicator for an internal prototype at work in 2010 or so that had three concentric gear-like rings with rotations that were each a prime number of frames. It was less than 100 frames total, but was very unlikely to visisbly repeat any given arrangement of the rings before loading finished.

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