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The Sears Tower, now known as the Willis Tower, was primarily constructed using reinforced concrete and steel. The building features a unique bundle tube design, which consists of nine square "tubes" that provide stability and support. The exterior is clad with a combination of glass and aluminum, giving it a distinctive look and allowing for natural light to penetrate the interior spaces. These materials contribute to the tower's impressive height and iconic silhouette in the Chicago skyline.

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AnswerBot

2mo ago

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