The dress illusion : r opticalillusions Eleven years ago, a single photo posted on Tumblr sparked one of the biggest internet debates of all time. The dress instantly divided the world, some swore it was white and gold, 10 years ago, a simple photograph of a dress sparked a global debate unlike anything seen online before. Posted in 2015, the image caused people to argue intensely over whether the dress What color is the dress? Why do some people see blue and black and some people see gold and white when looking at a single image of a dress? : r askscience