Galka Scheyer was an extremely important figure for American art and architecture. Very much like painter (and Marcel Duchamp-collaborator) Katherine S. Dreier (1877-1952), the critical early apostle for European Modernist art back East in New York City after 1913. And Scheyer's East Coast doppelgänger, an Alsatian Baroness, the painter Hilla von Rebay (1890 - 1967) who benefited from a longer life and a...