Lingering on the face of teenage rebel Antoine Doneil, the final frame of François Truffaut’s The 400 Blows (1959) spearheaded a revolution in cinema. Staring back at the camera with intensity and vulnerability, the then 14-year-old Jean-Pierre Léaud fashions such a gaze that even time itself must resign to a stop.This look not only launched the iconic French New Wave but also...