Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Illusions like these mess ...

How optical illusions work has been long-debated among scientists and philosophers, who wonder whether these illusions stem from neural processing in the eye or involve higher-level cognitive ...

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Optical illusions play tricks on your brain and can make you see things that aren't really there, from static images swirling around the page to images that stay with you even after you look away.