Attributed to Francesco Melzi · Public domain
Leonardo da Vinci
The Renaissance's argument that painting is a science of observation made flesh: Leonardo brought anatomy, optics and geology into the studio, perfected sfumato modeling, and left fewer than twenty finished paintings — among them the most famous painting on earth — alongside thousands of notebook pages on how seeing works.
According to Vasari, the young Leonardo, apprenticed in Andrea del Verrocchio's Florence workshop, painted one of the angels in his master's Baptism of Christ — now in the Uffizi — so beautifully that Verrocchio resolved never to touch color again, ashamed a boy had surpassed him. The story is likely embellished, but the painting survives, and the angel's soft modeling really does sit apart from the harder figures around it.
“Study the underlying causes — light, anatomy, structure — and the surface takes care of itself.”