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 ...

Our eyes can frequently play tricks on us, but scientists have discovered that some artificial intelligence can fall for the same illusions. And it is changing what we know about our brains. When we ...

Optical illusions are not merely tricks or viral brain teasers, they reveal the curious disconnect between what we see and what our brain interprets. A flat drawing might come across as ...