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.

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

There is a famous optical illusion called the Müller-Lyer illusion.By simply adding arrow-like shapes to both ends of line ...

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 ...

Optical illusion personality tests are interesting images that trick the brain and the into believing what we see first, ...

It’s like putting on ugly goggles. Puzzle lovers are getting the heebie-jeebies over this “freaky optical illusion,” which makes people’s faces look hideously distorted. A now-viral video detailing ...

For over 2,000 years, scholars and admirers have alleged that the ancient Greek building’s nearly imperceptible curves were ...

Medical imaging experts are adept at solving common optical illusions, according to research from four UK universities, including the University of East Anglia. The correct analysis of medical images ...

Elon Musk is on top of the world after Twitter accepted his $44 billion buyout offer on Monday. But the Tesla founder, 50, appears upside down in a new optical illusion that highlights how easy it is ...

Optical illusions are great fun, and they fool virtually everyone. But have you ever wondered if you could train yourself to unsee these illusions? Our latest research suggests that you can. Optical ...

Optical illusions thought to have influenced the design of the Parthenon in ancient Greece are not backed up by evidence or ...