In addition to the aphorisms that conclude "Dialectic of Enlightenment", Adorno put together a collection of aphorisms in honor of Horkheimer's 50th birthday that were later published as "Minima Moralia: Reflections from Damaged Life". These fragmentary writings, inspired by a renewed reading of Nietzsche, treated issues like emigration, totalitarianism, and individuality, as well as everyday matters such as giving presents, dwelling and the impossibility of love. In California Adorno made the acquaintance of Charlie Chaplin and became friends with Fritz Lang and Hanns Eisler, with whom he completed a study of film music in 1944. In this study the authors pushed for the greater usage of avant-garde music in film, urging that music be used to supplement, not simply accompany, films' visual aspect. Adorno also assisted Thomas Mann with his novel "Doktor Faustus" after the latter asked for his help. "Would you be willing," Mann wrote, "to think through with me how the work—I mean Leverkühn's work—might look; how you would do it if you were in league with the Devil?"