mark on Nostr: "Leonardo had studied the use of math for commercial purposes at his abacus school, ...

"Leonardo had studied the use of math for commercial purposes at his abacus school, but from Verrocchio he learned something more profound: the beauty of geometry. After Cosimo de' Medici died, Verrocchio designed a marble-and-bronze slab for his tomb, which was finished in 1467, a year after Leonardo became his apprentice. Instead of religious imagery, the tomb slab featured geometrical patterns dominated by a circle inside a square, as Leonardo would use for his drawing Vitruvian Man. Inside the design, Verrocchio and his workshop carved carefully proportioned rectangles and half-circles in colors that were based on harmonic ratios and the Pythagorean musical scale.

There was harmony in proportions, Leonardo learned, and math was nature's brushstroke."