Last updated on April 17, 2014 at 21:23 EDT

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2011-11-10 18:42:42

Vision is amazing because it seems so mundane. Peoples' eyes, nerves and brains translate light into electrochemical signals and then into an experience of the world around them. A close look at the physics of just the first part of this process shows that even seemingly simple tasks, like keeping a stable perception of an object's color in different lighting conditions or distinguishing black and white objects, is, in fact, very challenging. University of Pennsylvania psychologists, by...