In 1974, Philippe Petit gracefully navigated a 200-foot-long steel cable that he strung between the towers of the World Trade Center, nearly a quarter-mile above the streets of Manhattan. He 
traversed this cable eight times, for 45 minutes. The layperson will credit Petit’s feat to the 450-pound balancing pole he used during the stunt, but the French 
funambulist is quick to defend a more 
covert lifesaver: his knots. Why Knot? How to Tie More than Sixty Ingenious, Useful, Beautiful, Lifesaving, and Secure Knots! is Petit’s latest book, which the high-wire artist will discuss with a 
demonstration in knot-making. Perhaps he’ll even mention how he untied the knot in his stomach before performing the World Trade Center walk (groan).

Wed., April 17, 7 p.m., 2013