It's the way your eyes work. It has something to do with the cones in our eyes. If the cones (they have something to do with the lighting) are working correctly then it is black and blue. If they are not working correctly then it is whit and gold(Something to do with lighting). The dress is actually blue and black.
English
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Bump. Thanks for an educated response
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No problem. Am I the only one who finds this really interesting?