La Femme Strapless Long Plus Size Prom Dress PromGirl Dark Emerald 22W 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 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 ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive so we know the dress was black and blue BUT that's not what i'm here to discuss : r opticalillusions What Colour Is The Dress? White and Gold Explained