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Apparently the different perceptions of the color of the dress (blue and black vs white and gold) are a result of a phenomenon called "color constancy" where our brain uses (or tries to use) the context of an image to determine which colors we see. We're so close up to the dress that we don't know its surroundings and our brain has to make assumptions about them. A cool way our brains have evolved to interpret the world around us
Contributed by Sam Feldstone