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April 28, 2013

A shade of grey

"Eigengrau (German: 'intrinsic gray'), also called Eigenlicht ('intrinsic light'), dark light, or brain gray, is the color seen by the eye in perfect darkness. Even in the absence of light, some action potentials are still sent along the optic nerve, causing the sensation of a uniform dark gray color."

Posted by Ghost of a flea at April 28, 2013 09:27 AM