Alexander Calder's Flamingo is a 53-foot-high (16-meter-high), 50-ton (45,359-kilogram) steel sculpture that is the centerpiece of the Federal Plaza in front of the Kluczynski Federal Building on South Dearborn Street. It was constructed by Calder in 1973 and was unveiled in 1974. Flamingo was painted in a shade of vermilion, which has come to be known as Calder red, in order to offset the black steel buildings surrounding the plaza.The artwork is a type of sculpture known as a stabile. First pioneered by Calder, a stabile is a completely stationary abstract sculpture that in form is similar to a mobile. The difference is that a mobile moves with air currents.