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 Here's why people saw the dress differently. How "The Dress" Became an Illusion Unlike Any Other Scientific American The Science Behind the Dress Illusion Eyepic Eye Care The Dress puzzlewocky How "The Dress" Became an Illusion Unlike Any Other Scientific American