An article published by The Mona Lisa Foundation goes into some detail about the geometric underpinnings of Leonardo's design thinking.
It begins:
The important relationship of mathematics to art cannot be [overstated] when discussing Leonardo’s later work, and in numerous documents, letters and notes, the relevance of this is well documented. At times, he seems obsessed with these issues: while working on Mona Lisa for example, Leonardo is reported by Fra’ da Novellara to be concentrating intensely on geometry.
“Non mi legga chi non e matematico.”
“Let no one read me who is not a mathematician.”
-- Leonardo da Vinci
[Continue reading here.]
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