The science behind the dress colour illusion Internet The Guardian Color Illusion Dress Black And White Perception Black Gold Dress Illusion The Dress": Why People See 10 years since THE DRESS blew up Internet. Two thirds of people saw white and gold. Its an optical illusion caused by weird lighting and an overexposed background. It Is actuallylly blue and black. 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