Rudolf Bauer DARK SQUARE (1938) Oil on canvas Signed lower right: Bauer. Signed on the reverse upper left: Rudolf Bauer. The right outer colour stripe in dark blue mounted on a separate stretcher and attached by the artist 130,8 x 140,5 cm Das Geistreich, Museum Rudolf Bauer, Berlin (according to on the reverse stamp) / The Solomon R. Guggenheim Museum, New York / W. Forster, Sursee, Switzerland / Private collection, Israel New York, The Solomon R. Guggenheim Museum, Art of Tomorrow, Fifth catalogue of The Solomon R. Guggenheim Collection of Non-Objective Paintings, 1939, cat. no. 194, ill. p. 113