It's just a visual illusion caused by overstimulating your eyes (or something connected to them, Idk the exact biology.)

I can manually trigger the illusion just by focusing on a texture a certain way. You probably can even if you've never done LSD, you just wouldn't have any frame of reference and probably wouldn't notice it.

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Obviously, the colors aren't super vivid or whatever. You don't get high again. But textures will start to crawl around and distort if you just stare at them a certain way.