Why have critics questioned Alfred H. Barr, Jr.'s diagram of avant-garde art?

Critics have questioned Alfred H. Barr, Jr.’s famous flowchart of avant-garde art—first published in the 1936 Cubism and Abstract Art catalog—primarily because it presents a narrow, one-dimensional reading of art history that privileges formalist development over other influences.1

By placing Cubism at the center of his diagram as the primary driver of abstract art, Barr effectively established an "orthodox formal high line." Critics argue this approach is academic and prejudiced, as it relegates movements like German Expressionism, Dadaism, and Surrealism to the periphery, thereby falsifying their true significance and influence.1

Furthermore, in his essay "Nature of Abstract Art" (1937), Meyer Schapiro critiqued the diagram for assuming that artistic evolution occurs in a vacuum. Schapiro argued that Barr’s flowchart ignores the artist’s state of mind and the broader "extra-artistic reality"—the social, psychological, and historical contexts—that shape creative work. While Barr himself later acknowledged that modern art cannot be defined with finality, critics maintain that his institutional influence at the Museum of Modern Art helped codify a rigid, formalist canon that often overlooks the complexity of the contemporary art scene.21