An artist of the air re-creates his six-year plot to pull off an act of incomparable beauty and imagination One late-summer day, a feat of unimaginable audacity was perpetrated on the twin towers of the World Trade Center. The year was 1974. A hundred thousand people gathered on the ground to watch in awe as twenty-four-year-old high wire artist Philippe Petit made eight crossings between the all-but-completed towers, a quarter mile above the earth,...