The white gold or blue black dress: The widely published original Download Scientific Diagram 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 today, this dress was posted online, turning into a viral phenomenon. Viewers couldn't decide if the dress was blue and black, or white and gold. It was later confirmed ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive