“At times Leonardo was troubled by his lack of achievement. As a young man he appears to have developed a reputation for melancholia. “Leonardo,” wrote a friend, “why so troubled?” A sad refrain runs through his notebooks: “Tell me if anything was ever done,” he often sighs. Or in another place: “Tell me if ever I did a thing.”

“At times Leonardo was troubled by his lack of achievement. As a young man he appears to have developed a reputation for melancholia. “Leonardo,” wrote a friend, “why so troubled?” A sad refrain runs through his notebooks: “Tell me if anything was ever done,” he often sighs. Or in another place: “Tell me if ever I did a thing.”

— Ross King