Optical illusion renews blue and black dress debate nine years on Express.co.uk What colour is the dress? Explained : r interesting Picture Of Viral Blue And Black Dress Also Shows White And Gold, And Twitter Is Arguing Over It Again Evie Magazine How "The Dress" Became an Illusion Unlike Any Other Scientific American Ten years ago, a photo of a dress posted on Tumblr sparked a massive debate: was it blue and black or white and gold? Millions argued online, and even celebrities joined in. Scientists later explained