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.

Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and were seen in caves. Nowadays they are found all over the place – on screens, in books and even in ...

Illusions like these mess with the brain's visual processing system, making viewers see things that aren't there in reality. | Credit: Eva Almqvist via Getty Images Optical illusions play tricks on ...

This image seems to mimic the effect of movement-based vision. Puzzle lovers are questioning their vision after gazing at this trippy moving portrait, which seemingly transforms into different objects ...

Optical illusions can do wonders. These visual puzzles have the power to actually challenge your perception, hint at personality traits, and even enhance your vision. We often enjoy brainteasers for ...

If you have never seen an optical illusion, it is an image that makes you see things differently than they actually are. Optical illusions trick your eyes into believing you see something that is not ...

Even when you appear to stare steadily at an object, your eyes are constantly making tiny involuntary movements known as fixational eye movements. These include microsaccades, drifts and tremor.

It’ll spin your head right round, right round. This head-spinning optical illusion will have you second guessing your own sanity. It shows two rotating rings made up of six ovals. One is all black ...

Don't say it too loudly around your own feline, but cats tend to be easily tricked by all manner of quick-moving illusions or sleights of hand (i.e., laser pointers, shadows, movements under the ...

This optical illusion reveals how a person’s brain can change the color of the objects that they see. Experimental psychologist and artist, Akiyoshi Kitaoka, from Kyoto, Japan, posted a clip of the ...