A hidden horse is concealed in this viral optical illusion. Can you spot it in just 15 seconds? Test your brain and see how sharp your vision really is.

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This optical illusion might look simple at first, but only people with a high IQ—above 115—can identify the hidden horse instantly. If you pride yourself on your intelligence and sharp ...

The Best Illusion of the Year contest offers researchers, and participants, an opportunity to explore the gaps and limits of human perception.