@ARTICLE{10.21494/ISTE.OP.2020.0557, 

TITLE={From a simple drawing of Leonardo da Vinci to "first forms"}, 
  
AUTHOR={Jean-Pierre Crettez, }, 
	
JOURNAL={Art and Science}, 
	
VOLUME={4}, 

NUMBER={Issue 4}, 
	
YEAR={2020}, 

URL={http://www.openscience.fr/From-a-simple-drawing-of-Leonardo-da-Vinci-to-first-forms}, 
	
DOI={10.21494/ISTE.OP.2020.0557}, 
	
ISSN={2515-8767}, 
	
ABSTRACT={The geometric analysis of a drawing representing the profile of a man’s head gives us a glimpse of how Leonardo established his constructive approach to profiles from a first form. The geometric analysis of three other Leonardo profiles confirms this approach. It is with this same approach that Leonardo produced his five female portraits.}}