Proof the Dress Is Blue PS Tech The Science Behind the Black and Blue (or White and Gold) Dress The whole internet is arguing about the colour of this 'white and gold' dress (or is it blue and black?) The Mirror 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 perception Optical illusion renews blue and black dress debate nine years on Express.co.uk