Sigmund Freud has assigned human metal processes to three psychic zones: the id, the ego, and the superego, and the three major characters of this novel aptly correspond to the three zones.

• 弗洛伊德将人的心理活动解释为这三种力量相互作用的结果，而小说的三位主要人物与这三部分吻合得恰到好处。