So I searched up the black and blue dress : r opticalillusions 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 The Dress: Color debate rages on the Internet East Bay Times 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 1492: Dress Color explain xkcd