The story of the most important art show in U.S. history. Held at Manhattan's 69th Regiment Armory in 1913, the show brought modernism to America in an unprecedented display of 1300 works by artists including Picasso, Matisse, and Duchamp, A quarter of a million Americans visited the show; most couldn't make sense of what they were seeing. Newspaper critics questioned the artists' sanity. A popular rumor held that the real creator of one abstract...