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Home>Plan Your Visit>Tours, Guides, and Maps>Self-Guided Tours>Audio Stop 1

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Alexander Calder

## *Untitled*, 1976

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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