A rich perfume wafts through the sixth floor of the Museum of Modern Art, where the installation of Ed Ruscha’s full-dress survey “Now Then” is underway. You sense it before you see it: a room where the white walls are turning velvety brown. A chocolate room. “Chocolate Room” is an oddity in Ruscha’s influential oeuvre. Of the 85-year-old Nebraska native’s hundreds of projects — paintings, prints, and photo books; dry eulogies of Americana like SPAM cans and Mobil stations and two-lane blacktop — “Chocolate Room” is his only installation.

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Persons: Ed Ruscha’s, McPherson, Daniel, whisks, Robyn, Lynda, Kayla, It’s Organizations: Museum of Modern Art, La Paloma Fine Arts company, Mobil Locations: Nebraska, New York