Optical illusion: What to do? The challenge, this time, is deceptively simple: find the word ‘ball’ hidden in a grid full of the word ‘bill’. At first glance, the puzzle looks like a repetition of the ...

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 ...

Ready to have your mind irreversibly messed with? Prepared to spend a good few minutes squinting at your screen, confused and amazed? Rejoice then, because another brain-hurting optical illusion is ...