Is this a rabbit or a duck? The answer you give to this classic optical illusion says a lot about your brain, psychologists claim. It first appeared in a German magazine in 1892 under the title ...

Illusions aren’t just fun to look at — they reveal how your brain really works. One famous image, which looks like both a duck and a rabbit, shows how your mind makes choices without you even noticing ...

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A drawing from 1899 is sparking debate on social media and could shed light on how your brain works. In the following drawing, do you see a duck or a rabbit? Can you see both animals? According to The ...