On August 7, 1974, Philippe Petit stepped out on a wire illegally rigged between the New York World Trade Center's twin towers, where he performed for nearly an hour. The death-defiying event has been the subect of two major films, the documentary Man on Wire (2008) and The Walk (2015) staring Joseph Gordon-Levitt. During this history-making walk, and many others throughout his celebrated career, knots have always been indispensable components--the...