They talk about writing (Kafka's own, but also that of his favorite writers: Poe, Kleist, and Rimbaud, who transforms vowels into colors) as well as technology, film, crime, Darwinism, Chinese philosophy, carpentry, insomnia, street fights, Hindu scripture, art, suicide, and prayer.
Prayer, Kafka notes, brings its infinite radiance to bed in the frail little cradle of one's own existence.