A Dutch woman sparked a massive online debate Tuesday when she posted a photo of a pair of sneakers and innocently asked, 'What colour is this."
In this case, most people saw turquoise (or teal, or some other similar shade) and gray sneakers. But some swore they were seeing pink and white.
One person even readjusted the photo to argue that the shoe is pink and only looks gray because of bad lighting and a low-quality camera.
But then there were the helpless observers who couldn't make up their minds, saying they were seeing turquoise and gray at first -- but then were seeing pink and white.
"I HATE THIS IT'S LIKE THE DRESS ALL OVER AGAIN BUT I CAN'T HELP STARING AT IT," tweeted one person.
The sneakers tweet got over 1,000 comments, 2,500-plus retweets and more than 6,000 likes in 24 hours.
The shoe appears to be a retro women's Vans sneaker, listed as "mahogany rose" on the Vans website, according to TODAY.
There's a reason so many people see the same thing in different colors. Eye surgeon Paul Dougherty told TODAY in 2015 -- when the original #TheDress controversy erupted -- that "it's a perception issue."
"It's the way the brain processes information that comes in," Dougherty said. "Everyone's brain is different, so even though it's the same stimulus coming in, which it is, everyone processes the information differently."