Optical illusions have gained popularity on social media, and it has become a go-to brain teaser. Psychologists say optical illusions like this are more than just party tricks. They reveal how our ...

A viral optical illusion featuring a swirling circle has sparked fierce debate online, with people divided over what hidden ...

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Our pick of the best optical illusions of all time will leave you amazed and confused in equal measure.

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Have you ever looked at two circles of exactly the same size and sworn one was larger? If so, your eyes have been tricked by the Ebbinghaus illusion, a classic example of how context can shape what we ...

Duping a guppy is easier than duping a ring dove — at least when it comes to a classic optical illusion. In the Ebbinghaus illusion, two identical circles placed side by side are each framed by a set ...

The famous Ebbinghaus illusion, named for its discoverer, the German psychologist Hermann Ebbinghaus (1850–1909). Despite appearances, the two orange circles are the same size. Have you ever looked at ...