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 I've been thinking about "the dress" for 10 years. Here's what I've learned. The Ballroom Blacks Black & Powder Blue Polka Dot Dress Sock Over The Calf Blue and Black Houndstooth Dress Socks Over the Calf L