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Six black, wedgelike shapes, one dark blue arrowhead shape, and six red triangular shapes with rounded corners are connected with thin rods to form this abstract sculpture. In this photograph, we look up at the piece to where it hangs from the glass ceiling of a light-filled interior space with marble walls. The paddle-like shapes are attached to the end of the curved rods, which are linked together like branches. In our view, the black arm curves up across the top of the picture and the red arm curves down into the lower right corner, and to our left. Each red paddle is smaller as they move from the central armature to the end of the branch.

Alexander Calder

Untitled, 1976

East Building, Ground Level — Atrium

Alexander Calder’s monumental mobile moves solely on the air currents in the East Building Atrium. This motion is possible because the mobile was constructed in aluminum rather than welded steel, which was Calder’s customary choice of material. The sculptor considered installing a motor, but the use of advanced, lightweight materials made this unnecessary. Although the sculpture’s wingspan exceeds 85 feet, the entire work weighs only 920 pounds—two tons less than if it were made of steel.

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