Rows of black and white zigzag patterns forming 2x2 checkerboards on a grey background create an optical illusion of warping and motion. https://files.mastodon.social/media_attachments/files/111/940/925/133/779/666/original/8d48654ddbee10cb.jpg
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