ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive Eleven years ago, a single photo posted on Tumblr sparked one of the biggest internet debates of all time. The dress instantly divided the world, some swore it was white and gold, Viral 'Blue and Black or White and Gold' dress marks 10 years YouTube 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 perception Black and Blue or White and Gold? How Your Brain Sees 'the Dress' Business Insider