When reading the text, the reader has the impression that the narrator's mental state is chaotic, confused, and verging on insanity. This increases the suspense because the reader does not know if the narrated facts are real, or are a result of the narrator's mental state.
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It is important to note that this question is about the short story "The Outsider" written by Lovecraft, where we are introduced by a man who feels tormented in the castle where he lives.
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