Figure 7. Leonardo da Vinci, Sketches of the Moon, Codex Atlanticus, fol. 674v, 1513–1514. Charcoal, black chalk, and brown ink on paper, 500 × 350 mm (19 11/16 × 13 13/16 in.). Biblioteca Ambrosiana, Milan. Veneranda Biblioteca Ambrosiana, Milan, Italy © Veneranda Biblioteca Ambrosiana/Metis e Mida Informatica/Mondadori Portfolio/Bridgman Images.