1964
National Gallery of Art, 1820
National Gallery of Art, 1860
National Gallery of Art, 1993
National Gallery of Art, 1804
National Gallery of Art, 1495
National Gallery of Art, 1751
National Gallery of Art, 1969
National Gallery of Art, 1956
National Gallery of Art, 1939
National Gallery of Art, 1968
National Gallery of Art, 1623
International Art Foundation, Inc., 1921
![An Ascending Spiral of Figures [recto]](https://api.nga.gov/iiif/4b46b349-c6de-4c90-bf14-394ac054be51/full/843,/0/default.jpg)
![Figure 7 [working proof]](https://api.nga.gov/iiif/6c0a537e-66ff-48ef-8b3c-04f8642b8dd9/full/843,/0/default.jpg)
