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 The Dress divided the Internet, but it's really about subtraction Science News Why is it so hard for people to see black and blue?' Salvation Army uses 'The Dress' to talk about domestic abuse Orange County Register How does a black and blue dress sometimes appear white and gold? The Brains Blog