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.

Some optical illusions are pretty basic and fly under the radar, unseen forever. Others have taken the web by storm, going viral and confusing everyone. It's interesting to notice that everyone sees ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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