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 often go viral, but they've been around long before social media. Here are 10 historical illusions that still leave people puzzled.

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 ...

These mental litmus tests will melt your mind. Puzzle lovers are straining their brains trying to solve a trio of baffling optical illusions, which reportedly reveal how the viewer’s mind works. A ...

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 ...

Even if you have perfect vision, you can't always trust your eyes. The image above created by Lenstore illustrates this. The circle on the left appears to be a lighter shade of blue than the circle on ...

What you see is what you get — but that’s not what’s actually out there. You’re probably familiar with plenty of optical illusions, from the Necker cube to the dress that broke the internet. We’ve ...

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 ...

Sometimes, optical illusions are nothing more than interesting, with no real insight into you as a person. These visual perceptions can transform human faces into aliens, confuse you by simply turning ...

Optical illusion personality tests are interesting brain teasers that trick the brain and eyes into believing what they see ...

New research indicates that very low doses of LSD can make the world look blurrier, more colorful, and more dynamic to ...