Recto: "Libro Primo, Chapo Quarto..." (Vitruvius, Book 1, Chapter 4); Verso: The Fortification of City Walls (Vitruvius, Book 1, Chapter 5)., 1530–45

Drawing. Date: 1530–45. Dimensions: sheet: 5 5/8 x 11 1/16 in. (14.3 x 28.1 cm). Medium: pen and dark brown ink. Collection: Metropolitan Museum of Art.