ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY
Hollow-face illusion, computer artwork. This is an optical illusion where the perception of a concave (hollow) mask of a face appears as a normal convex (protruding) face. This is because the brain has a strong bias for seeing faces as convex, which counteracts competing depth perception information, such as highlights and shadows.
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