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 Original Optical Illusion Blue And Black Dress Is This Dress Blue And Black Or White And Blue and Gold Dress: Understanding the Optical Illusion 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.