Optical illusions trick your brain into seeing motion

Optical illusions make your brain see movement where there is none, revealing how human vision can be surprisingly flawed. Your brain quickly processes visual information using shortcuts, often expecting continuity or filling in gaps. For example, the phi phenomenon makes two flashing lights appear as one moving light, much like old theater marquees. The rotating snakes illusion also makes static patterns seem to swirl due to how your eyes and brain detect motion.