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 The Dress: An Interactive Classroom Experiment by Andrew Robinson Precarious Physicist Medium ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive The Science of Why No One Agrees on the Color of This Dress WIRED Understanding the Black and Blue Dress Illusion