This is the Tree of Proportions and Proportionality from the *De* *Divina Proportione* of Luca Pacioli (1445 - 1509), published in 1509. Some of the terms in Pacioli's tree are familiar today and some are taken from the study of proportions by Nicomachus in his *Arithmetic,* but the meanings of some other terms are not generally known. It would be a worthwhile project to go through the tree and decipher the meanings of all of the terms in it.

One image from *De* *Divina Proportione* of a stellated dodecahedron. This was a woodcut print of an illustration by Leonardo Da Vinci.

- Another "mathematical treasure" in
*Convergence*provides additional information about Pacioli’s*Divina proportione,*along with two images from the copy housed at the University of Oklahoma Library. - Another article in
*Convergence*displays illustrations of the Platonic solids, prepared for*De Divina Proportione*by Leonardo da Vinci.