He describes the house of Usher in a gloomy and dark tone, "Nevertheless, in this mansion of gloom I now proposed to myself a sojourn of some weeks." In this, the narrator uses the word gloom to give an overarching description of the mansion giving it a depressing and sad feeling. This is Poe expressing his own views of how something as amazing and beautiful as a mansion is still gloomy because to him everything is dark and gloomy. Then later Poe uses similar language do describe a room in the house, "Dark draperies hung upon the walls. The general furniture was profuse, comfortless, antique, and tattered. Many books and musical instruments lay scattered about but failed to give any vitality to the scene. I felt that I breathed an atmosphere of sorrow. An air of stern, deep, and irredeemable gloom hung over and pervaded all." In this passage, he uses gloom a second time to describe the room as well as sorrow, dark and tattered all these words give the description a darker and more depressing tone. Poe again uses these words due to his dark view of life and his gloomy feeling, he describes everything in the story in a dark and somber way.
In "The Fall of the House of Usher" Poe also displays his dark romanticism in his writing style of projection of one's inner state onto something of someone else. He does this with both the sister of Roderick as a symbol and projection of the brother's inner state of mind and with the house as a symbol for the Usher family