The quality of portraying real figures in real
pictorial space is a distinct Renaissance characteristic.
Ironically, the invention of mathematical rules for correct
perspective came not from a painter, but from Filippo Brunelleschi
(1377-1446), who was trained as a goldsmith. Brunelleschi made at
least two paintings in correct perspective, but is best remembered
for designing buildings and over-seeing the building works.
Unfortunately, no writings on perspective by Brunelleschi have
survived, and it is entirely possible that he in fact never wrote
anything on the subject.