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 How "The Dress" Became an Illusion Unlike Any Other Scientific American The dress was a viral online phenomenon in 2015, centered on a photograph of a dress that people disagreed on whether it was blue and black or white and gold. Within a Here's why people saw the dress differently. Blue black or white gold? The dress debate is over