Richard Sapper: “I distinguish between two different kinds of seating positions: ‘imposed’ and ‘free’. Seating is ‘imposed’ either by a specific kind of function or restricted spatial conditions. Seating in this category includes all kinds of cars, tourist class airplanes, and space module seats which are limited by available space.
"In contrast to ‘imposed’ seating there is ‘free’ seating; which means sitting on a chair in any position you like. This dynamic seating describes those whose work does not require any specific seating position. They can move their bodies and thus ease and redistribute the weight imposed on muscles, ligaments, tissues and above all, the spine. This dynamic seating requires a chair which facilitates such movement.
"The Knoll chair has been designed, and is based, on the ergonomic principles of ‘free’ seating. The chair frame is generously proportioned with wide, flat seating and supporting surfaces rather than molded or rigid contours. The suspension system is a knoll exclusive: a unique rubberized nylon mesh which conforms easily to a variety of body shapes. This straightforward design means that the chair provides comfortable dynamic seating without constant readjustment."