How has wirelessness—being connected to objects and infrastructures without knowing exactly how or where—become a key form of contemporary experience? Stretching across routers, smart phones, netbooks, cities, towers, Guangzhou workshops, service agreements, toys, and states, wireless technologies have brought with them sensations of change, proximity, movement, and divergence. In Wirelessness, Adrian Mackenzie draws on philosophical techniques from a century ago to make sense of this most contemporary postnetwork condition.