Black heart describes a cold world filled with the smell of death. In particular, the dark center of Africa has become a part of the world. As a result, through the hero's words, Conrad emphasized that "in a lonely-absolutely lonely place, not even the police, I can't hear a kind neighbor whisper a piece of advice about public opinion to you." You have to rely on your own strength. " Black heart has two clues. One is Marlowe's whole process of entering the African jungle, and the other is the depravity and crime of Courths, a European hybrid who is engaged in ivory business alone in Congo virgin forest. Courths Degen grew up in solitude, but also became seriously ill in solitude, while Marlowe experienced great loneliness in the process of searching for Courths, but found darkness. Marlowe also found his own loneliness in the search for his true self, and was destined to be lonely.
"Narrenschif" also means there is a madman on board. This special boat was originally a custom spread in the Rhine region of Germany: people gathered crazy people on a boat and then threw them into the river. According to Foucault's textual research, Narrenschif has been given a new meaning in the15th century: "The soul, like a boat, is abandoned on the endless see of desire, on the barren land of anxiety and ignorance, or in the irrational world." Between the complicated rivers or in the boundless sea, the people on board are prisoners of the journey and abandoned in the lonely darkness. "Narrenschif" is doomed to loneliness.