Optics.- Rubens (Peter Paul).- Aguilon (François d') Opticorum libri sex Philosophis iuxta ac Mathematicis utiles, first edition, half-title, fine engraved title and 6 head-pieces by Theodor Galle after Peter Paul Rubens, numerous woodcut diagrams and illustrations in text, woodcut decorative initials and tail-pieces, final f. with large woodcut printer's device recto otherwise blank, occasional spotting or light staining, lightly browned throughout, new endpapers, contemporary calf, rebacked in a modern light brown morocco in compartments, gilt and with a black morocco label, corners repaired, covers rubbed and scuffed, [Norman 25; NLM/Krivatsy 92; Martin Kemp, The Science of Art, 1990, pp. 101-104], folio, Antwerp, widow and sons of J. Moretus in the house of Plantin, 1613.

⁂ As well as providing a compendium of classical and modern works on optics, he describes his original theory of binocular vision (later disproved) and for the first time his invention of the horopter. This is one of only seven books known to have been illustrated by Rubens, a friend of the publisher Balthasar Moretus. D'Aguilon's colour theory and his prescriptions for the mixing of colours are known to have been used in Rubens's paintings.