Optical illusions are older than you think. The first optical illusions date back to 20,000 BC and took the form of cave sculptings. Nowadays they are found all over the place – on screens, in books ...

Optical illusions play tricks on your brain and can make you see things that aren't really there, from static images swirling around the page to images that stay with you even after you look away.

The op-art loving side of the internet has developed a new obsession – the reverspective optical illusion. Taking Reddit by storm, the simple yet ultra-satisfying visual transforms right before our ...