Another design by Hans J. Wegner that was so complex for its time, it wasn't able to be put into production until nearly 50 years later. Wegner designed the Carl Hansen CH20 Elbow Chair in 1956 with a solid wood frame and upholstered laminate seat. The distinctive backrest, which also sticks out far enough to support arms (hence the name "Elbow Chair"), is steam bent out of a single piece of wood. Stackable up to 4 high.