Not since the communist Diego Rivera painted his mural for Rockefeller Center has there been such a ruckus about a piece of art in Midtown. The contretemps has erupted over Eric Fischl’s “Tumbling Woman,” which he sculpted during the weeks when he kept thinking of the image of bodies falling from the World Trade Center. “I didn’t see it,” he told our Rachel Donadio last week, “but it was the most complicated, infinitely complicated resonant image.” He captured it in the form of a woman in free fall, her legs in the air, her head and neck pulling her downward...