Art Deco may be hard to define, but you know it when you see it. Its architecture is at once angular—associated with shapes such as chevrons and triangles—and arcs.

A 1936 poster, designed by Gert Sellheim, one of 58 pieces displayed in “Art Deco: Commercializing the Avant-Garde,” opening Sept. 28 at Poster House in Manhattan.

The 1,046-foot-tall Chrysler Building, completed in May of 1930, was the pinnacle of both the then-unnamed Art Deco period and the skyscraper boom that rapidly transformed New York City’s skyline.

The Art Deco building was designed by William Manley King andbuilt in 1939by the Works Progress Administration to serve as a training center for soldiers and National Guardsmen.

The Nassau County Museum of Art’s new exhibit, “Deco at 100,” opens on Jan. 18, showcasing paintings, furniture, fashion and sculptures that capture the decorative art movement of the 1920s.