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The Philadelphia Museum of Art’s Ruth and Raymond G. Perelman Building, just across the street from the larger museum, is a 1927 Art Deco building housing: the museum’s user-friendly library; archives; the costumes and textiles collection; and “Collab,” a superb assemblage of modern and contemporary design. Stop in to view designs by Ruhlmann, van der Rohe, Breuer, Nelson and husband-and-wife team Charles and Ray Eames. (Photo by G. Widman)