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 ELI5:Why does this dress appear white gold to some people and black blue to others? : r explainlikeimfive Neuroscientists Explain Discrepancy Behind "The Dress" Illusion The science behind the controversial blue black, gold white dress