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 ...

Ever wondered if animals like sheep or goats see the world the same wacky way we do when we look at optical illusions? Turns out they do. A recent study led by Alina Schaffer at the University of ...

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 ...

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In the above image, you can all see a dense cluster of green leafy plants growing close together, likely a shrub or hedge. Many green leaves are oval-shaped, glossy, and healthy-looking, with sunlight ...

A quick optical illusion puzzle that tests attention to detail and visual focus by asking readers to find a hidden odd number.

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 ...