PositiveThe Atlantic...the influence of Calder’s contemporaries shouldn’t undercut the originality of the artist’s vision. That is the argument Jed Perl makes in his exhaustive two-volume biography, Calder ... Perl offers a sweeping dismissal of previous assessments of Calder, particularly those that emphasized the lighthearted and derivative dimensions of his work ... Perl keeps his eye on the ambition and intellectual rigor beneath the image of Calder the naïf stumbling upon success and beauty, though some of the artist’s contemporaries, at least initially, were more amused than impressed ... Perl probes and elaborates, singling out, for example, the concept of \'parity\' in physics as fundamental to Calder’s ideas about symmetry, balance, and movement.