Flamingo, created by noted American artist Alexander Calder, is a 53 foot (16 m) tall stabile located in the Federal Plaza in front of the Kluczynski Federal Building in Chicago, Illinois, United States. It was commissioned by the United States General Services Administration and was unveiled in 1974, although Calder's signature on the sculpture indicates it was constructed in 1973. Flamingo weighs 50 tons, is composed of steel, and is vermilion in color. Calder gave the stabile its color, which has come to be called "Calder red", to offset it from the black and steel surroundings of nearby office buildings, including the Ludwig Mies van der Rohe-designed Kluczynski Federal Building. The stabile is an art form which Calder pioneered. It is an abstract structure that is completely stationary, as opposed to a mobile, which can move with air currents.