Divina proportione, later also called De divina proportione is a book on mathematics written by Luca Pacioli and illustrated by Leonardo da Vinci, completed by February 9th, 1498 in Milan and first printed in 1509. Its subject was mathematical proportions and their applications to geometry, to visual art through perspective, and to architecture. The clarity of the written material and Leonardo's excellent diagrams helped the book to achieve an impact beyond mathematical circles, popularizing contemporary geometric concepts and images.
Woodcut illustrating proportions of the human face
Fra. Luca Bartolomeo de Pacioli was an Italian mathematician, Franciscan friar, collaborator with Leonardo da Vinci, and an early contributor to the field now known as accounting. He is referred to as the father of accounting and bookkeeping and he was the first person to publish a work on the double-entry system of book-keeping on the continent. He was also called Luca di Borgo after his birthplace, Borgo Sansepolcro, Tuscany.
Portrait of Luca Pacioli, traditionally attributed to Jacopo de' Barbari, 1495
A woodcut of Pacioli which appears throughout the Summa de arithmetica
The first printed illustration of a rhombicuboctahedron, by Leonardo da Vinci, published in Divina proportione
Woodcut illustrating the proportions of the human face from the second part of Divina proportione, which covers the Vitruvian system