Proporciones del ojo y la cabeza (Leonardo da Vinci)

Leonardo da Vinci: Drawings from the Biblioteca Reale in Turin. Birmingham Museum of Art. Sept. 28 through Nov. 9. Recto: Proportions of the head and eye, ca. 1489/90, pen and brown ink with stylus on laid paper, 197 x 276 mm (two attached sheets), inv. no. 15574/15576