Atrium
Unlike other Senate office buildings arranged around courtyards, the Hart building has a 90-foot (27 m) high central atrium, which brings natural light into corridors and offices. Walkways bridge the atrium on each floor. Located on either end of the atrium are elevator banks and skylit semicircular staircases.
The centerpiece of the atrium is Alexander Calder's mobile-stabile Mountains and Clouds. The monumental piece combines black aluminum clouds suspended above black steel mountains, with the tallest peak being 51 feet (16 m) high. It was one of Calder's last works. The sculptor came to Washington on November 10, 1976 to make the final adjustments to his model, and died later that evening after returning to New York. Budget cuts delayed construction of the sculpture until 1986, when former New Jersey Senator Nicholas F. Brady raised private funds to underwrite the installation.
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