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 Primavera Couture 4192 Size 2,10,16 Gold Sequin Prom Dress Peak Point Pageant Gown Slit Formal 16 Gold Spaghetti Strap V Neck Rose Gold Sequins Long Prom Dresses With Split Why millions can't see eye to eye in dress color debate Black Stripe Gold Sequin Halter Mermaid Prom Dress Promfy 11 years ago today, a dress was posted on Tumblr. It was later confirmed to be Black and Blue.