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These rows are perfectly horizontal and are not moving. A mind-bending anomalous motion variation of the Café wall illusion by Akiyoshi Kitaoka.
Source: http://www.psy.ritsumei.ac.jp/akitaoka/motion30e.html
Image transcription: Rows of black and white zigzag patterns forming 2x2 checkerboards on a grey background create an optical illusion of warping and motion.
(Originally published on mastodon.social: 2024-02-16)
The illusion when moving it up and down does not even break when the picture is very out of focus and viewed with one eye. So there must be something fundamental about the rough shapes and/or color grading. All the fine details are irrelevant.