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Hearst Tower
Foster + Partners
New York, NY
2006

The Hearst Tower’s triangular frames, known as diagrids, eliminate the need for any vertical steel columns around the building’s perimeter. It is the first building in North America to feature this ­gravity-­defying technique. So efficient is Foster’s design that the building uses 20 percent less steel tonnage than a conventional building of its size.

Credit: Chuck Choi/Arcaid/Corbis

Credit: Foster + Partners

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