CORRECTION

Through the actions of a proofreader in the final stages of production, the reference to Hans Hofmann in the last paragraph of Mr. Morgan's essay was changed to Heinrich Hofmann. Our most sincere apologies to Robert C. Morgan, to Art Editors John Yau, Ben La Rocco and Thomas Micchelli, and to Managing Art Editors Patricia Milder and Kara L. Rooney.

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