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 ...

This optical illusion asks viewers to stare at a black X inside a blue circle without blinking. The idea is to tire out the ...

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While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.

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 ...

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 ...