The first design of the Butterfly chair was designed in Buenos Aires, Argentina in 1938 by the architects Antonio Bonet, Juan Kurchan and Jorge Ferrari Hardoy, who had met as assistants in Le Corbusier's Paris atelier, and founded the think tank named Grupo Austral. The chair is occasionally known as the BKF chair, for Bonet-Kurchan-Ferrari, but an official letter from the firm attributed primary authorship of the design to Ferrari-Hardoy, which is why it is also occasionally known as the Hardoy chair.[1] The first of its design was composed of two bent tubular steel rods and a leather sling creating a suspended seat. The frame of the chair is painted black; the sling is brown leather.