If there's one thing the internet loves, it's a good optical illusion. The most recent brain-boggling viral hit is this deceptively simple purple elephant illusion that appears to transform right ...

Optical illusions occur naturally in different habitats and conditions across the world. Cloud formations can sometimes make it seem like there's an ocean or a UFO in the sky. Whether it is salt flats ...

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 ...

Hidden number and letter optical illusions are some of the most satisfying puzzles because they look unbelievably simple until you actually try them. In this challenge, you are shown a neat grid ...