When you buy through links on our articles, Future and its syndication partners may earn a commission. Illusions like these mess with the brain's visual processing system, making viewers see things ...

An optical illusion is a type of illusion that occurs in the visual system, causing something to appear that does not actually exist or that is different from reality. There are a wide variety of ...

Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

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.