The dress is black & blue, but here's why you can't tell TJ Kelly How I Flipped My Brain's View of the Black and Blue Dress Jeff Greenhouse Black And Blue Dress Debate TheDress one year on eight things we learned from the viral phenomenon Social media The Guardian The Truth About the Dress: Black and Blue Explained Ten years ago, a photo of a dress posted on Tumblr sparked a massive debate: was it blue and black or white and gold? Millions argued online, and even celebrities joined in.