1956–2004
National Gallery of Art, 1924
National Gallery of Art, 1884
National Gallery of Art, 1999
National Gallery of Art, 1929
National Gallery of Art, 1958
National Gallery of Art, 1866
National Gallery of Art, 1972
National Gallery of Art, 1800
National Gallery of Art, 1831
National Gallery of Art, 1937
National Gallery of Art, 1435
![Skizze für Frühe Menschen (Sketch for Early Men) [p. 8]](https://api.nga.gov/iiif/898d8730-7070-4f4d-9327-450588728cc4/full/843,/0/default.jpg)
![Akrobat auf Schaukel (Acrobat in a Swing) [p. 19]](https://api.nga.gov/iiif/c7a34540-897f-4bc5-a322-4a7fe26e95e1/full/843,/0/default.jpg)
![Leonello d'Este, 1407-1450, Marquess of Ferrara 1441 [obverse]](https://api.nga.gov/iiif/d055ff33-5c6f-491f-ae0d-bbb3193e5c96/full/843,/0/default.jpg)