In 2015, a photograph of a dress went viral, dividing viewers over whether its colors were blue and black or white and gold. This optical illusion highlighted differences in human color perception The infamous "black & blue" dress debate is back with new evidence In 2015, a photograph of a dress went viral, dividing viewers over whether its colors were blue and black or white and gold. This optical illusion highlighted differences in human color perception Why the dress is blue (but white to you) White and gold or blue and black? What colour is the dress? London Evening Standard The Standard ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive