Between divine and human proportion.

A monk called Luca Pacioli wrote a book titled «The Divine Proportion» and asked Leonardo Da Vinci to illustrate it. When the artist finished all the drawings Luca examined them and said: «Your work is fantastic.» «Thank you father Pacioli » replied Leonardo. «Your book deserved that and more.» «I was right when I decided to ask you to illustrate my book because I knew you would love the theme of proportions. You showed me the sketch of the Vitruvian Man you drew and I was really impressed » said Pacioli.

Da Vinci explained that Vitruvio was a roman architect who had written about human proportions. These proportions are considered the canon of art, «Did you know that the distance from your elbow to your fingertips is a fifth of your height?» said Leonardo. «And the distance from your elbow to your armpit is an eighth of your height? And did you know that the length of your hand is a tenth of your height?»