Three ages of art's rebirth
Vasari arranges art history as a sequence of three ages. The first runs from Cimabue and Giotto, who broke from the rigid Byzantine manner. The second, with Masaccio and Brunelleschi, mastered rule, proportion and perspective, and the third, with Leonardo, Raphael and Michelangelo, added a grace beyond rule that surpasses even the ancients. The scheme judges each artist by how far he advanced the imitation of nature, so the earlier masters rank as necessary steps toward a peak rather than as ends in themselves.