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 Chic Black Long Gold Lace Embellished Velvet llusion Neck Evening Prom Dress 38 Velvet Black Dress With Illusion Cutouts and Slit 42001 Jovani Amazon.com: Adrianna Papell Studio Women's Beaded Illusion Neck Dress, Black Gold, 4 : Clothing, Shoes & Jewelry Here's why people saw the dress differently.