As social primates, humans have a keen interest in where people are looking. Vision research Pawan Sinha of the Massachusetts Institute of Technology shows us with this illusion that our brains determine gaze direction by comparing the dark parts of the eyes (the irises and pupils) with the whites. In the normal photograph of Humphrey Bogart, the actor appears to be looking to his left, but in the photo negative he appears to be looking in the opposite direction even though his face is still turned toward the left. Even though we know that the irises are white in the reverse image, we can’t change our perception of the illusion.This is really amazing .
-www.scientificamerican.com/
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