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 Light Blue Cheap Babydoll Dresses Chiffon Babydoll Dress In Light Blue LUCY IN THE SKY Illusion Plunge Floral Sequin Sheath Dress in White Blue Stunning Prom Dresses from Lucy in the Sky for 2024 How "The Dress" Became an Illusion Unlike Any Other Scientific American This explains how the blue black white gold dress illusion was possible. But it doesn't explain why some people saw it one way and some saw it the other, and no one seemed to see