What colour is the dress? Why some people see white and gold and others see blue and black National Post 10 years ago, a simple photograph of a dress sparked a global debate unlike anything seen online before. Posted in 2015, the image caused people to argue intensely over whether the dress Is The Dress blue and black or white and gold? The answer lies in vision psychology Psychology The Guardian Optical illusion renews blue and black dress debate nine years on Express.co.uk Black and blue or white and gold, #thedress, Adobe think they've cracked it