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 Sparkly Black Mermaid Off Shoulder Prom Dresses, MP1006 Musebridals LF 7828 Off the Shoulder Long Sleeve Mermaid Prom Gown with Sheer Boned Bodice L EMERALD Is That Dress White and Gold or Blue and Black? The New York Times