Johann Esaias Nilson, ‘Invention d'une Cascade (Design for a Cascade)’, ca. 1755/1760, National Gallery of Art, Washington, D.C.
plate: 26.8 x 19.9 cm (10 9/16 x 7 13/16 in.)  sheet: 40.3 x 25.1 cm (15 7/8 x 9 7/8 in.)