Universe

work by Calder

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In Willis Tower: Construction and renovations
…an enormous motorized mural named Universe, which he called a “wallmobile.” The tower’s observation deck, the Skydeck, is located on the 103rd floor. In the early 21st century the Skydeck underwent a major renovation that included the addition of the Ledge—four glass boxes that extend 4.3 feet (1.3 meters) from…
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