01/7 Describe what you observe in this image.
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Optical illusions expose how our brains fill gaps and shape perception. The term comes from Latin illudere meaning to mock. Some illusions jump out. Others demand focus. Here you likely first see an archway that also forms the bald head and bearded face of an elderly man. Yet the scene hides nine distinct faces. Many viewers stop at the obvious. Sharp observers track down every hidden one.
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