Woman discovers the iconic 'Optical Illusion Dress' that went viral in 2015 at yard sale Times of India ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive The Science Behind the Black and Blue (or White and Gold) Dress The dress was black and blue, but the conditions of the photograph caused many to perceive it as white and gold, creating debate. Within a week, more than ten million tweets had