The Science of Why No One Agrees on the Color of This Dress WIRED 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 White Gold Or Blue Black? Twitter's Divided Again But Not Over A Dress That Dress is Blue and Yellow! This holiday, @zara is serving slinky dresses, shimmery tops and the kind of energy that says main lights off, disco ball on.