You hold a smartphone in your hand. And we do—at restaurants, at the movies, walking across the street, and even in bed. We use smartphones to check our mail, update Facebook, get driving directions, search the Internet to settle bets, and, sometimes, even to make calls. But Glass you wear on your face, and that fundamentally transforms all these human-computer interactions, making them more intimate. Because you don’t use your hands, and because it projects an image onto a transparent screen suspended in front of your eye and uses a vibration to stimulate your inner ear, using Glass is like being naked with the machine: synapses and wires united.