Bowerbirds create stages that make them look bigger to potential partners. Fish and butterflies can flash what looks like a large, staring eye to intimidate predators or deflect attacks. Male peacock ...

Have you ever looked at two circles of exactly the same size and sworn one was larger? If so, your eyes have been tricked by the Ebbinghaus illusion, a classic example of how context can shape what we ...

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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 ...

What if the eyes of an animal you are looking at are not real at all? Across forests, oceans, and grasslands, several animals ...

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 ...

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