The claustrophobia of the mansion affects the relations among characters. For example, the narrator realizes late in the game that Roderick and Madeline are twins, and this realization occurs as the two men prepare to entomb Madeline. The cramped and confined setting of the burial tomb metaphorically spreads to the features of the characters. Because the twins are so similar, they cannot develop as free individuals. Madeline is buried before she has actually died because her similarity to Roderick is like a coffin that holds her identity. Madeline also suffers from problems typical for women in -nineteenth--century literature. She invests all of her identity in her body, whereas Roderick possesses the powers of intellect. In spite of this disadvantage, Madeline possesses the power in the story, almost superhuman at times, as when she breaks out of her tomb. She thus counteracts Roderick’s weak, nervous, and immobile disposition. Some scholars have argued that Madeline does not even exist, reducing her to a shared figment Roderick’s and the narrator’s imaginations. But Madeline proves central to the symmetrical and claustrophobic logic of the tale. Madeline stifles Roderick by preventing him from seeing himself as essentially different from her. She completes this attack when she kills him at the end of the story.
Doubling spreads throughout the story. The tale highlights the Gothic feature of the doppelganger, or character double, and portrays doubling in inanimate structures and literary forms. The narrator, for example, first witnesses the mansion as a reflection in the tarn, or shallow pool, that abuts the front of the house. The mirror image in the tarn doubles the house, but upside down—an inversely symmetrical relationship that also characterizes the relationship between Roderick and Madeline.
The story features numerous allusions to other works of literature, including the poems “The Haunted Palace” and “Mad Trist” by Sir Launcelot Canning. Poe composed them himself and then fictitiously attributed them to other sources. Both poems parallel and thus predict the plot line of “The Fall of the House of Usher.” “Mad Trist,” which is about the forceful entrance of Ethelred into the dwelling of a hermit, mirrors the simultaneous escape of Madeline from her tomb. “Mad Trist” spookily crosses literary borders, as though Roderick’s obsession with these poems ushers their narratives into his own domain and brings them to life.
The crossing of borders pertains vitally to the Gothic horror of the tale. We know from Poe’s experience in the magazine industry that he was obsessed with codes and word games, and this story amplifies his obsessive interest in naming. “Usher” refers not only to the mansion and the family, but also to the act of crossing a -threshold that brings the narrator into the perverse world of Roderick and Madeline. Roderick’s letter ushers the narrator into a world he does not know, and the presence of this outsider might be the factor that destroys the house. The narrator is the lone exception to the Ushers’ fear of outsiders, a fear that accentuates the claustrophobic nature of the tale. By undermining this fear of the outside, the narrator unwittingly brings down the whole structure. A similar, though strangely playful crossing of a boundary transpires both in “Mad Trist” and during the climactic burial escape, when Madeline breaks out from death to meet her mad brother in a “tryst,” or meeting, of death. Poe thus buries, in the fictitious gravity of a medieval romance, the puns that garnered him popularity in America’s magazines.