We regularly touch and handle media devices. At the same time, media devices such as body scanners, car seat pressure sensors, and smart phones scan and touch us. In Horn, Henning Schmidgen reflects on the bidirectional nature of touch and the ways in which surfaces constitute sites of mediation between interior and exterior. Schmidgen uses the concept of "horn"--whether manifested as a rhinoceros horn or a musical instrument--to stand for...