Autostereograms
Autostereograms, also known as Magic Eye pictures, are optical illusions that appear to be abstract patterns or random dots at first glance but, when viewed correctly, a hidden three-dimensional image emerges from the chaos. The magic lies in the way our brains process visual information. They basically work by creating a grayscale depth map of the hidden image, where darker points represent objects farther away and lighter shades indicate closer points. Then, a 2D pattern is overlaid on this depth map to camouflage the image. When you focus your eyes beyond the surface of the picture, the brain deciphers the subtle differences in depth, revealing the hidden 3D shape.
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