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 ...

If you’ve spent much time on the internet over the past decade or so, you’ve probably seen the optical illusions of Zach King. The 31-year-old illusionist and internet personality has a YouTube ...

Like any magic trick, this optical illusion requires careful planning and a particular perspective. A hand places a metal ball at the bottom of a 3D printed slide and the ball immediately rolls uphill ...

Finding hidden objects in optical illusion images can offer a good mental workout. These visual illusions are not just fun games. These visual riddles can help to reveal if your brain is sharper and ...