Lyubov Popova, Untitled, 1915, Oil on canvas, 106.4 × 71.1cm (41.9 × 28 in), Solomon R. Guggenheim Museum, New York Gift, George Costakis, 1981 Guggenheim Museum
Lyubov Popova, Birsk, 1916, Oil on canvas, 106 × 69.5cm (41.7 × 27.4 in), Solomon R. Guggenheim Museum, New York Gift, George Costakis, 1981 Guggenheim Museum