10 years ago, a simple photograph of a dress sparked a global debate unlike anything seen online before. Posted in 2015, the image caused people to argue intensely over whether the dress Sparkling Royal Blue Mermaid Blue Sparkly Prom Dress with Gold Sequins and Beaded Crystal Embellishments for Black Women Perfect for Birthday Photo finally solves the black and blue white and gold dress debate 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