“It all began in a simpler time—February 2015 — on an ordinary Thursday evening when a photo of a dress posted on Tumblr got picked up by BuzzFeed. Was the dress white and gold, or blue and black? The question pitted brother against brother, friend against friend, caused celebrities to weigh in, and basically ground the internet to a halt. The dress was actually blue, but that hardly mattered. … What mattered was that the chasm between perception and reality had opened up, and we found ourselves teetering on the edge.”