ROC5455484: The vessels of liver, spleen and kidneys, c.1508 (verso of 5455483), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

AII143388: Detail of the Dragon from the drawing Fight between a Dragon and a Lion (brown ink with wash on paper), Vinci, Leonardo da (1452-1519) (school of) / Gabinetto dei Disegni e Stampe, Galleria Degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

GIM5038005: Fight between a Dragon and a Lion (brown ink with wash on paper), Vinci, Leonardo da (1452-1519) / Gabinetto dei Disegni e Stampe, Galleria Degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

CH376610: The Codex Hammer or Codex Leicester, pages 48-51, 1508-12 (sepia ink on linen paper), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

ROC5892728: Recto: The bones of the foot, c.1510-11 (black chalk, pen and ink, wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5617347: A cavalcade, c.1503-4 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XIR154608: Study of figures for 'The Adoration of the Magi' (pen and ink on paper), Vinci, Leonardo da (1452-1519) / Louvre, Paris, France / Bridgeman Images

XIR154639: Six Figures, Study for an Epiphany (pen and ink on paper), Vinci, Leonardo da (1452-1519) / Louvre, Paris, France / Bridgeman Images

GIA4811167: Model of the air screw made from the drawing of Leonardo da Vinci (Leonardo da Vinci), flying machine, helicopter ancestor - Museum of Science and Technology of Leonardo da Vinci, Milan, Vinci, Leonardo da (1452-1519) (after) / Museo Nazionale della Scienza e della Tecnologia 'Leonardo Da Vinci', Milan, Italy / Bridgeman Images

ROC700095: The Heart, lungs, liver, spleen and kidneys, with blood vessels, and notes, c.1508-10 (pen & ink over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3900536: The head of Leda c.1505-06 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC871640: A scheme for a canal to bypass the Arno, c.1503-04 (pen & ink with wash over chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC427429: Horse in profile divided by lines, c.1480 (pen & ink and chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC4820280: Studies of horses and horses' heads, c.1490 (metalpoint on buff prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC405195: Vessels of the thorax, with comparison of the heart and a germinating seed, c.1508-09 (pen & ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

KRD249761: 'Mona Lisa', 2003 (oil on canvas), Xin, Yin (b.1959) / Private Collection / Bridgeman Images

ROC5674275: A design for an equestrian monument, c.1485-88 (metalpoint on blue-grey prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC486893: A map of the Arno east of Florence, 1504 (pen & ink with wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC5846285: Verso: The vessels of the neck and shoulder, c.1508 (pen and ink over black chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC3899944: Sketches of the bust of a woman, c.1490 (metalpoint on pale buff prepared paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

ROC399235: A deluge, c.1517-18 (chalk on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

CTS336313: Portrait of a young man, possibly Girolamo Casio, c.1500 (oil on wood panel), Boltraffio, Giovanni Antonio (1467-1516) / The Devonshire Collections, Chatsworth / Bridgeman Images

MEV5045234: Codex Atlanticus, sheet 33 recto, 1478-1518 (pen & ink), Vinci, Leonardo da (1452-1519) / Veneranda Biblioteca Ambrosiana, Milan, Italy / Bridgeman Images

XJF308795: Astronomical diagrams, fol. 2r from the Codex Leicester, 1508-1512 (pen & ink on paper) (b/w photo), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

BEN140572: Annunciation, (detail), c.1475 (oil and tempera on wood) (post-restoration), Vinci, Leonardo da (1452-1519) / Gallerie degli Uffizi, Florence, Tuscany, Italy / Bridgeman Images

ROC3823039: Verso: The proportions of the leg and foot, c.1490 (pen & ink on paper) (verso of 3823038), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

CHT231134: Head of an Old Man in Profile, facsimile copy (pen and ink on paper), Vinci, Leonardo da (1452-1519) (after) / Bibliotheque des Arts Decoratifs, Paris, France / Bridgeman Images

ROC5894044: Verso: Studies of the fetus, related internal organs, and the arm, c.1511 (pen & ink on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

XBP341805: A page from the Codex Leicester, 1508-12 (sepia ink on linen paper), Vinci, Leonardo da (1452-1519) / Private Collection / Bridgeman Images

XIR1147462: School of Athens, from the Stanza della Segnatura, 1510-11 (fresco) (detail of 472), Raphael (Raffaello Sanzio of Urbino) (1483-1520) / Vatican Museums and Galleries, Vatican City / Bridgeman Images

XJF366933: Leonardo da Vinci, engraved by Raphael Morghen, 1817 (engraving) (b/w photo), Vinci, Leonardo da (1452-1519) (after) / Private Collection / Bridgeman Images

GIM4253598: Copy of the Battle of Anghiari (29 June 1440), Vinci, Leonardo da (1452-1519) / Bridgeman Images

XJF311217: Battle between a Rider and a Dragon, c.1482 (stylus underdrawing, pen and brush on paper), Vinci, Leonardo da (1452-1519) / British Museum, London, UK / Bridgeman Images

XCF282030: Studies for a Virgin and Child and of Heads in Profile and Machines, c.1478-80 (pencil and ink on paper), Vinci, Leonardo da (1452-1519) / British Museum, London, UK / Bridgeman Images

ROC5907191: Cats, lions, and a dragon, c.1517-18 (black chalk, pen & ink and wash on paper), Vinci, Leonardo da (1452-1519) / Royal Collection Trust / Bridgeman Images

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