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.

A fun optical illusion has been shared online which may suggest whether you're a positive person or prefer to keep your distance from others and it all depends on what you see first ...

For the first time, research shows that a certain kind of visual illusion, neon color spreading, works on mice. The study is also the first to combine the use of two investigative techniques called ...

A head-scratching optical illusion challenges the perception of color and how the brain plays tricks on us. In an image created by the UK contact lens vendor Lenstore, a series of lilac letters ...

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 ...

Look closely at this visual and decide what you actually see—jellyfish or something completely different. This optical illusion challenges perception and shows how the brain can interpret images in ...