ROC3931872: A standing masquerader, c.1517-18 (black chalk, pen & ink and wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC427435: Job's tears, c.1510 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC427432: Study for an equestrian monument, c.1517-18 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XOT366472: Model reconstruction of da Vinci's design for a beating wing (wood and cloth), Vinci, Leonardo da (1452-1519) (after) / Private Collection / Bridgeman Images

ROC399270: The muscles of the leg and the intercostal muscles, c.1510 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892753: Recto: The bladder, c.1508 (traces of black chalk, pen and ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892743: Verso: The mechanics of the arm in man and monkey, c.1508 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

CH376612: The Codex Hammer or Codex Leicester, 1508-12 (sepia ink on linen paper), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

ROC478418: The head of a man with a diagram in place of the eye, c.1513 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC412170: Studies of flowing water, c.1510-13 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC692842: Studies for an equestrian monument, c.1517 (black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892735: Verso: The muscles of the lower leg, c.1510-11 (pen and ink over traces of black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5455483: The heart compared to a seed, c.1508 (pen & ink and chalk on paper) (recto of 5455484), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3899942: Verso: The foetal blood supply of the cow, c.1508 (pen & ink on paper) (verso of 3899941), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XJF311215: Study of a man blowing a trumpet in another's ear, and two figures in conversation, c.1480-82 (pen and ink on paper), Vinci, Leonardo da (1452-1519) / British Museum, London, UK / Bridgeman Images

ROC5892725: Six studies of the bones and muscles of the arm, c.1508-10 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892736: Recto: The muscles of the leg, c.1510-11 (black chalk, pen & ink, wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

CHT231133: Bone Structure of the Human Neck and Shoulder, facsimile copy (pen & ink on paper), Vinci, Leonardo da (1452-1519) (after) / Bibliotheque des Arts Decoratifs, Paris, France / Bridgeman Images

ROC5617343: A deluge, c.1517-18, (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3090465: A bird's-eye view of the Valdichiana, c.1503-04 (charcoal, pen & ink with wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC437790: The principal organs and vessels of a woman, c.1510 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC700110: The brachial plexus, c.1508 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5455482: The bone and vessels of the thigh, c.1508-10 (pen & ink and chalk on paper) (verso of 5455481), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XOS3432851: Head of Virgin, 1508-1512 (black chalk, charcoal, and red chalk, with some traces of white chalk on card), Vinci, Leonardo da (1452-1519) / Metropolitan Museum of Art, New York, USA / Bridgeman Images

LRI4572912: Study for the Adoration of the Magi (Pencil drawing, 15th-16th century), Vinci, Leonardo da (1452-1519) / Gabinetto dei Disegni e Stampe, Galleria Degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

ROC5669155: A bust of a child from the front and back, c.1500 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

MEV5045460: Codex Atlanticus, sheet 139 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC3823041: Verso: Studies of human proportion, c.1490 (pen & ink on paper) (verso of 3823040), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3823040: Recto: Studies of human proportion, c.1490 (pen & ink on paper) (recto of 3823041), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5674281: The hands of St John in the Last Supper, c.1495 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5674283: Recto: The torso and leg of a nude man in profile, and a study of machinery, c.1488-90 (pen & ink over traces of black chalk on paper) (recto of 5674284), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR161934: Study of nude men (pen and ink on paper), Vinci, Leonardo da (1452-1519) / Ecole Nationale Superieure des Beaux-Arts, Paris, France / Bridgeman Images

ROC700101: Study of the Larynx, trachea, oesophagus and stomach, c.1508 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

MEV5045496: Codex Atlanticus, sheet 157 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5047332: Codex Atlanticus, sheet 1070 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

MEV5047387: Codex Atlanticus, sheet 1097 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images