Batcolumnn, or Bat Column, is a 101-foot tall scupture that stands outside of the Harold Washington Social Security Administratin Building. It gets its name because it looks like an upright baseball bat. It was designed by Claes Oldenberg and dedicated in 1977. The United States General Service Administration commissioned the sculpture. A plaque attached to the sculpture explains its design: Oldenberg selected the baseball bat as an emblem of Chicago's ambition and vigor. The sculpture's verticality echoes the city's dramatic skyline, while its form and scale cleverly allude to more traditional civic monuments, such as obelisks and memorial columnns.