10. Leonardo da Vinci. Study for Hercules holding a club seen in rear view (detail), ca. 1506–8. Soft black chalk or charcoal, sheet 53/8 x 51/2 in. (13.7 x 14 cm). The Metropolitan Museum of Art, Purchase, Florence B. Selden Bequest and Rogers Fund, and Promised Gift of Leon D. and Debra R. Black, 2000 (2000.328b) 11. Leonardo da Vinci. Heroic nudes (anatomy and static and dynamic equilibrium) and a battle scene, ca. 1503–6. Red chalk and pen and ink, 61/4 x 6 in. (16 x 15.3 cm). The Royal Collection, Royal Library, Windsor Castle (RL 12640) 12 (opposite). Leonardo da Vinci. Studies of how the body generates movement by shifting its center of gravity in running and other movements, ca. 1490–92. Pen and ink, page 83/8 x 53/4 in. (21.2 x 14.5 cm). Manuscript A, fol. 28v (detail). Bibliothèque de l’Institut de France, Paris (2172)
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