Now, in order to claim some knowledge of painting, Vitruvius speaks of the consideration of the perfect human body and about how good sculptors and painters in order to make it give it a height of ten faces, and I say that according to them they have read and they say that this proportion is based on knowledge of measurement and that it happens that without it it is not possible to have proportion or consideration because those who are not cognisant of this do not count.

Cited by Liane Lefaivre and Alexander Tzonis