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Leonardo da Vinci, Design for a Flying Machine, ca. 1480, ink on paper,Milan, Biblioteca Ambrosiana, Codex Atlanticus f. 858r.
Infant Saint John the Baptist ('The Burlington House Cartoon'), ca. 1499-1500, charcoal (and wash?) heightened with white chalk on paper, mounted on canvas, London, The National Gallery.
In this magnificent preparatory drawing or ‘cartoon’ for the Madonna of the Rocks, the artist uses colour and shading to create an effect of chiaroscuro and give this drawing a painterly quality.
Michelangelo, Study for the Battle of Cascina, 1504, pen and ink on paper, Oxford, Ashmolean Museum.
Leonardo da Vinci, Anatomical Studies, ca. 1504-6, pen on prepared paper, Royal Library of Turin.
Leonardo da Vinci, Study of Two Warriors' Heads for the Battle of Anghiari, ca. 1504-05, black chalk or charcoal, some traces of red chalk on paper, Budapest, Szépművészeti Múzeum.
Leonardo da Vinci, Superficial Anatomy of the Shoulder and Neck, ca. 1510, Pen and ink with wash, over traces of black chalk, Windsor, Royal Collection.
Michelangelo, Three Studies of a Leg, first half of 16th century, pen and ink on paper, Florence, Gallerie delle Uffizi.
Leonardo da Vinci, Presumed Self-Portrait, ca. 1512, red chalk on paper, Royal Library of Turin.