And please note that the figures in the Schlemmer are walking up the staircase. Upward movement in art often hints at lofty belief, as in, say, Titian’s “Assumption of the Virgin” or Barnett Newman’s emphatically vertical “zips.” Downward motion, by contrast, can evoke Dada irreverence and, in particular, Marcel Duchamp’s “Nude Descending a Staircase,” the Cubist painting that created a brouhaha at the Armory Show of 1913 because neither a nude nor the alleged staircase could be located in its welter of tilting planes.

Lichtenstein, a pioneer of postmodern recycling, swiped the subject of his mural from a beloved masterpiece of German painting — Oskar Schlemmer’s “Bauhaus Stairway,” of 1932, which is owned by the Museum of Modern Art. The painting depicts an actual staircase at the Bauhaus, the progressive art school that opened in Weimar, Germany, in 1919, and exemplified the modern movement at its most extroverted and techno-friendly. Artists claimed a bond with designers and engineers and set out to repair the world.