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The human mind is constantly looking for patterns everywhere. Just take a look at some clouds, you’ll see what I mean.

Recognising people, faces, animals and objects with limited and noisy data is very hard, so mistakes happen all the time. More specifically false positives are far more common than false negatives. This means that it’s very easy to see faces in the clouds rather than missing faces in a crowd.

Same error occurs when looking at this picture. It’s basically an optical illusion that exploits the human pattern recognition system.