It's the seemingly simple dress that's causing a huge stir in offices around the country, and appears to have broken the internet.
Possibly the most divisive question of the day is "What colour is it?"
— Laurel Irving (@laurelirving7) February 27, 2015
Celebs have weighed in and scientists have also had their say.
An explanation why you see this dress as blue and black or white and gold. pic.twitter.com/ayXpqavC9B
— Andy Rexford (@andyrexford) February 27, 2015
I don't understand this odd dress debate and I feel like it's a trick somehow. I'm confused and scared. PS it's OBVIOUSLY BLUE AND BLACK
— Taylor Swift (@taylorswift13) February 27, 2015
The 'Great Dress Debate of 2015' has also inspired violent reactions from firm "Black and Blue" supporters.
— Krister Johnson (@KristerJohnson) February 27, 2015
It left some scratching their heads.
The color of a dress? Really? That's what you're asking Me? THE OCEAN LEVELS ROSE FOUR INCHES IN TWO YEARS. You know that, right?
— God (@TheTweetOfGod) February 27, 2015
— QPS Media Unit (@QPSmedia) February 27, 2015
And others feeling victorious after apparently solving the mystery.
— Adobe (@Adobe) February 27, 2015
News break – February 27