"Market booths use a lot of mild steel sections, and mild steel tends to rust, unlike stainless steel, so it needs protection," says architect Daniel Patzold.

建筑师Daniel Patzold说，“市场棚亭使用了大量的碳钢构件，它们和不锈钢不一样，它们很容易生锈，所以必须有保护措施。”

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Architects such as Dankmar Adler, Daniel Burnham, John Wellborn Root and Louis Sullivan, making use of such innovations as steel, lifts and electricity, soon developed the skyscraper.

ECONOMIST: To natural assets add art, learning and fun

Daniel Garber employs broken Impressionist brushstrokes in "The Bridge at New Hope" (1952), its steel-truss span evoking the serene industrial views of Charles Sheeler and the American Precisionists.

WSJ: Nature in America | A Landscape in Evolution | By Barrymore Laurence Scherer