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Re:Children of a Thailand tribe who see with clarity beneath... by m463 on Thursday August 29, 2019 @11:59PM (#20835881)
I always thought the brain's visual processing was straightforward until I saw a pinwheel illusion at a museum once.

Here are some examples to try:

https://www.youtube.com/watch?v=qam3-uyj0_A

https://www.youtube.com/watch?v=GhyEIAfyXx8

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