The way people work is changing quickly. About two thirds of workers use at least two devices—tablets, smartphones, computers—every day. Trouble is, standard office chairs are built for people who sit in front of a monitor: back straight, elbows down, feet firmly on the floor. When a person leans, lifts, or hunches, the chair's armrests and back don't move with him, causing discomfort. So furniture designers at Steelcase built Gesture, the first chair that supports the slouched backs and roving elbows of mobile-device users.