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The narrator
Other than the title, The Telltale Head being a play on The Telltale Heart the similarities lie in The Telltale Heart having the narrator, who is presumably the murderer, being haunted by the sound of the victim's beating heart. Bart, who is also the narrator of The Telltale Head briefly, is haunted by the voice of Jebidiah Springfield.
The word "mad" or "insane" could be used to describe the narrator at the end of "The Tell-Tale Heart" as his paranoia and guilt over the murder drive him to confess in a frenzied and delusional manner.
Yes the narrator of 'The Tell-Tale Heart' is insane - likewise the narrator of 'The Cask of The Amarillo' although not quite badly. However all Gothic literature doesn't have to have an insane narrator. in fact the majority of Gothic literature has perfectly sane narrators in a gruesome world.
The narrator tells in an attempt to convince us that he is not insane.
The Tell-Tale Heart begins with the narrator insisting that they are not insane despite their meticulous planning to murder an old man who they claim has an evil eye. The narrator's obsession with the old man's eye drives them to commit the crime.
The narrator invited him to stay and put the chair over the where he put the body. By doing this Poe has the narrator show an over confidence of not being found out for the murder, but his conscience gets to him and he begins to hear the heart beating. The reader all ready knows that the narrator isn't sane because of his actions every night with the light and looking to see the eye of the old man. The fact he invited the policeman to stay just reinforces the idea he is insane.
Paranoid, guilty, haunted, stressed.
The narrator decides to murder the old man because of his vulture-like eye and the fear it instills in him. He plans the murder meticulously, ensuring that no trace is left behind.
In "The Tell-Tale Heart," the narrator believes the neighbor is insane because of the old man's distorted eye, which unsettles and terrifies him. The neighbor's appearance and behavior contribute to the narrator's perception of madness, leading to his eventual violent actions.
The narrator in "The Tell-Tale Heart" is disturbed by his neighbor's pale, vulture-like eye, which he finds unsettling and believes is evil. This eye ultimately becomes the focus of the narrator's obsession and drives him to commit murder.
One example of onomatopoeia in "The Tell-Tale Heart" is the sound of the old man's heart beating loudly, which is described as "thump, thump, thump" as the narrator becomes more and more agitated by the noise.