Prismatic, on the other hand, navigates the shoals of predictability and incoherence with whimsy and grace. Use it for a few days, and you’ll find yourself wondering, “How in the world did it know that I would be interested in that?” Use it for months, and you may suspect that the site knows you better than you know yourself. As you click on some stories, skip others, and save a few to read later, you can sense it continually revising its internal model of your interests. If there were a Turing test for suggestion services, Prismatic would come close to passing.