Symbolism, Imagery, Allegory
We’ve seen that art mirrors reality in this story, but there are several other cases of “doubling” or “reflection” going on. Starting off the story is the inverted reflection of the House of Usher in the tarn that lies before the house. You’ve also got the inverted dichotomy between Madeline and Usher, twins, but male/female, mental/physical (see “Character Analysis”), alive/dead. Dichotomy means a division between two opposing things.