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 How "The Dress" Became an Illusion Unlike Any Other Scientific American 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