Counterpoise is a plywood chair whose shape embodies the idea of interplay: it is comprised of two wooden parts that balance each other. Taken separately, each part would be unsteady, but taken together they function as a steady-state system. Counterpoise is reduced to two fundamental elements for a chair: the seat and the backrest. The design process started on the base of fluid form language and developed an intuitive final shape that dialogues with the human body. The lines of the wooden parts were dictated by the human proportions and ergonomics principles. The results is a chair that is both sumptuously tactile and elegantly technical.