In Jean-Paul Sartre's "Nausea," the protagonist grapples with existential angst, leading him to question the nature of his existence. He reflects on the feeling of being a mere phantom, which conveys his deep sense of alienation and disconnection from reality. This turmoil marks a pivotal point in his journey, as he confronts the absurdity of life and the search for meaning amid his disorientation.

This statement highlights the core themes of existentialism that Sartre explores throughout the novel, emphasizing the struggle with identity and purpose. As the character confronts his fears and perceptions, it reveals the universal human experience of doubt and the desire to affirm one's place in the world. Sartre’s work prompts readers to consider their own existence and the complexities of being.