Ludwig Mies van der Rohe, a pioneer of modern architecture, built this boxlike bronze-and-glass tower in 1958. The austere facade belies its wit: I-beams, used to hold buildings up, are here attached to the surface, representing the idea of support. The Seagram Building's innovative ground-level plaza, extending out to the sidewalk, has since become a common element in urban skyscraper design.
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