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Image courtesy Frits Bonjernoor
In a series on the neuroscience behind visual illusions, Susana Martinez-Conde and Stephen L. Macknik in the Scientific American:
Our face-detection neural machinery can be overloaded. There’s a man’s face hidden in this image. But before we spill the beans about its location, look around and see if you can find it yourself. It’s difficult! Don’t give up too quickly: finding the face may take you a few minutes the first time you look. But once you have seen it, you will always find it immediately in every subsequent search.
Give up? Check out the Scientific American for where to find it and for 9 more such illusions
You see embedded spirals, right, of green, pinkish-orange, and blue? Incredibly, the green and the blue spirals are the same color.