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 ...

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 among the most popular online challenges today. It is considered the simplest way to test an individual ...

This fun visual optical illusion challenges you to find a hidden butterfly among colourful parrots in just 15 seconds. Can ...