In all of his furniture designs Mart Stam relied on straightforward forms, an aesthetic economy of means in the construction and the benefit of improved seating comfort. In the case of S 43 he combined the tubular steel frame with moulded plywood shells for seat and back and thus created an absolute reduction. Due to the comfortable flexing effect of the frame, uphol- stery is unnecessary. Its clear, reserved form makes this cantilever chair an exemplary design in the spirit of modernism. Today, Thonet owns the artistic copyright for this strictly cubic “chair with no rear legs”.