... [Perl] does not generally seek to prove or explain or argue for the deeper seriousness of Calder’s sculptures, and perhaps he should not need to do so. Instead, he allows the lavish illustrations to speak for themselves while he charts Calder’s life through a well-researched and engaging narrative rich in anecdotes. Like most biographers, Mr. Perl is fully on the side of his subject and quick to leap to Calder’s defense when he feels that a critic like Greenberg, or a dealer like Pierre Matisse, has behaved badly toward his protagonist.