In commemoration of R. Aharon Lichtenstein’s tenth yahrzeit, his son, R. Mayer Lichtenstein, published “Musar Avi,” a volume of written adaptations of his annual yahrzeit shiurim delivered over the past decade, alongside eulogies and letters from his father. Each chapter dialogues with one of R. Aharon’s foundational essays. Yitzchak Blau’s Alt+SHIFT shows how the son conveys his father’s character, analyze his Torah, and add his own valuable insights.