ROC427428: A horse's left fore-leg with measurements, c.1490 (pen & ink and charcoal on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR156515: Head of a Child (pencil on paper), Vinci, Leonardo da (1452-1519) / Louvre, Paris, France / Bridgeman Images

FIT156935: Rider on Rearing Horse, c.1481-82 (silverpoint, pen & brown ink on prepared paper), Vinci, Leonardo da (1452-1519) / Fitzwilliam Museum, University of Cambridge, UK / Bridgeman Images

ROC5648231: The skeleton, c.1510-11 (chalk, pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

LRI4635241: Geometry: “” An Icosahedron”” Page taken from the manuscript “” De divina proportione”” (On divine proportions) by mathematician Fra Luca Pacioli dit Luca di Borgo (1445-1517) illustrated by Leonardo da Vinci (1452-1519).1509., Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

GIA5036017: The palm and the buoy, c. 1487-89 (drawing), Vinci, Leonardo da (1452-1519) / Bibliotheque de l'Institut de France, Paris, France / Bridgeman Images

MEV5047309: Codex Atlanticus, sheet 1058 verso, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC3740752: The Alps seen from Milan, c.1510-11 (red chalk with white heightening on pale red prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XBP340118: A page from the Codex Leicester, 1508-12 (sepia ink on linen paper), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

FAF152189: Study for the Head of Mary Magdalene (charcoal on paper), Vinci, Leonardo da (1452-1519) / Galleria degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

ROC700111: The veins of the arm, c.1508 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

MEV5045229: Codex Atlanticus, sheet 30 verso, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

JLJ4570493: Portrait of a woman known as Isabella d'Este, 1500 (pencil), Vinci, Leonardo da (1452-1519) / Louvre, Paris, France / Bridgeman Images

ROC399233: The anatomy of a bear's foot, c.1485-90 (pen & ink with heightening over metalpoint on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC1546906: A copse of trees, c.1500-10 (red chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

MEV5046880: Codex Atlanticus, sheet 844 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

ROC3956004: A map of the Arno west of Florence, 1504 (pen and ink, green and blue wash, over black chalk and stylus), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC700093: The Aortic Valve, c.1512-13 (pen & ink on blue paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC399279: The stomach and intestines, c.1508-09 (pen and ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XKH179010: Study of St. Sebastian, 1480-81 (pen & ink over pencil on paper), Vinci, Leonardo da (1452-1519) / Hamburger Kunsthalle, Hamburg, Germany / Bridgeman Images

FTB165451: Virgin and Child with St. Anne, c.1501-10 (pen and ink on paper), Vinci, Leonardo da (1452-1519) / Gallerie dell'Accademia, Venice, Italy / Bridgeman Images

ROC443646: Studies of the heart and pulmonary vessels, c.1511 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC615079: The Heart, lungs and other organs, c.1508 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

LRI4575795: Presumed Self-portrait (Lucan portrait of de Vinci), 1490-1500 (tempera on panel), Vinci, Leonardo da (1452-1519) / Galleria degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

JEP99710: Fight between a Dragon and a Lion (pen and ink on paper) (print), Vinci, Leonardo da (1452-1519) (school of) / Private Collection / Bridgeman Images

ROC493253: Marsh marigold (Caltha palustris) and wood anemone (Anemone nemorosa), c.1505 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC443714: The head of a youth in profile, c.1510 (chalk on red paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC399276: The Skeleton, c.1510 (pen & ink with wash over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC409854: The muscles of the upper spine, c.1510 (pen & ink with wash, over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5892727: Recto: The bones and schematised muscles of the leg, c.1510 (pen & ink over traces of black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC409848: The drapery of a kneeling figure, c.1491-94 (brush & black ink heightened with white on blue prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC478422: A standing masquerader, c.1517 (black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3703867: A study of drapery for a Salvator Mundi, c.1504-8 (red chalk with touches of white chalk and pen and ink on pale red prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3955998: The rivers and mountains of central Italy, c.1502-4 (pen and ink, and brown and blue wash, over black chalk), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR217648: Dodecahedron, from 'De Divina Proportione' by Luca Pacioli, published 1509, Venice (engraving) (b/w photo), Vinci, Leonardo da (1452-1519) / Bibliotheque Nationale, Paris, France / Bridgeman Images

XJF311691: Study for a Madonna with a Cat, c.1478-80 (pen and ink over stylus underdrawing on paper), Vinci, Leonardo da (1452-1519) / British Museum, London, UK / Bridgeman Images