a person born blind cannot tell you since he has never seen black. a person who becomes blind... what does he see? does he see black?... and if so.. why? if a person has absolutely no nerves going from the eye to the brain. does the brain register that as black? and why? black is supposed to be the sum of all colors. if you take all colors of the rainbow and mix them together. do you not get black? so black is not the lack of color but all colors seen at the same time.