Big Top Mechanics

Alexander Calder's training as an engineer helped him ultimately to create massive sculptures requiring precise equilibrium. But he honed his mechanical ingenuity - and whimsy - tinkering with miniature circus figures like those in "Prima Donna, Woman with Bow, and Horse" (123/8" x 51/2" x 6") at right. It's now on display at New York's Whitney Museum of Art, part of the exhibit Alexander Calder: The Paris Years, 1926-1933, which runs until February 15, 2009. Henry Petroski discusses engineer-artists in this month's Refractions, page 29.

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