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Optical Illusion: Are These Circles Moving or Not?
the thread has some great examples of it actually moving. https://twitter.com/Jakesaurius/status/1331542934056001536
I don't think this is an optical illusion. Cover the arrows with your fingers and you'll see the circles are actually moving around, not just rotating. You can use your finger to compare the distance between the circles and see it change over time.