An optical illusion challenges readers to find Batman hidden among numerous cartoon bats. The puzzle highlights how our brains group similar patterns, making it difficult to spot subtle differences.

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 have never seen an optical illusion, it is an image that makes you see things differently than they actually are. Optical illusions trick your eyes into believing you see something that is not ...