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 White And Gold Or Black And Blue: Why People See the Dress Differently ABC News Remember when the internet went absolutely nuts on the colour of a dress? The dress was blue and black. The original viral poster, Caitlin McNeill, later said it was a black and blue dress so we know the dress was black and blue BUT that's not what i'm here to discuss : r opticalillusions The Dress Illusion McMahon Opticians A Professional Eye Test Opticians in Falkirk