1944–1949
National Gallery of Art, 1915
National Gallery of Art, 1480
National Gallery of Art, 1959
National Gallery of Art, 1935
National Gallery of Art, 1972
National Gallery of Art, 1958
National Gallery of Art, 1937
National Gallery of Art, 1936
National Gallery of Art, 1963
National Gallery of Art, 1946
National Gallery of Art, 1922
National Gallery of Art, 1762
![Entwurf zu "Vogelspiel" (Sketch for "Birdplay") [p. 31]](https://api.nga.gov/iiif/09dbd1de-8492-417e-8571-fe45ac9cd6c5/full/843,/0/default.jpg)
![Springing Unicorn and Tau Cross [reverse]](https://api.nga.gov/iiif/65e15a24-59a1-4638-9a24-90adf47e92bc/full/843,/0/default.jpg)
