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 ...

The famous Ebbinghaus illusion, named for its discoverer, the German psychologist Hermann Ebbinghaus (1850–1909). Despite appearances, the two orange circles are the same size. Have you ever looked at ...

Guppies are highly susceptible to the Ebbinghaus illusion. Ring doves? Not so much. For instance, guppies and ring doves diverged hundreds of millions of years ago and hence are phylogenetically ...

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 can test our brain function and eyesight, keeping us sharp and ready for the day ahead. Take the autumn scenery pictured below. It may seem like just a mess of leaves that have ...

This type of illusion is called the The Troxler Effect, and was developed by physician Ignaz Paul Vital Troxler in 1804. It reveals that everything exists in reality, although our perception makes ...

A head-scratching optical illusion challenges the perception of color and how the brain plays tricks on us. In an image created by the UK contact lens vendor Lenstore, a series of lilac letters ...

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