Paul Klee, Errand Boy (Ausläufer), 1934, Watercolor, gouache, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33968

Paul Klee, Old Dwarf (Alte Zwergin), 1933, Pigmented paste on paper on board, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34046

Paul Klee, Intoxication (Im Rausch), 1939, Pigmented paste on tracing paper on board, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34149

Paul Klee, Ohne Titel, c. 1938, Schwarze Kleisterfarbe und Tempera auf Zeitungspapier auf Karton, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/102025

Paul Klee, Letter Ghost (Geist eines Briefes), 1937, Pigmented paste on newspaper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33063

Paul Klee, Heroic Strokes of the Bow (Heroische Bogenstriche), 1938, Pigmented paste on newspaper on dyed cloth on board in artist's frame, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38349

Paul Klee, Blick in das Fruchtland, 1932, Öl auf Karton, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/4081