In writing Michelangelo’s Vita in 1568, Giorgio Vasari remarked that in his old age the revered sculptor burned many of his drawings, discarding everything he considered less than a perfect creation, thereby destroying any evidence that could have left his monumental greatness in doubt. Although modern scholars frequently question the veracity of Vasari’s anecdotes, this one rings true for two reasons. On the one hand, it is a well-known fact that Michelangelo was an exacting...