Poe uses dark, vivid imagery and hypnotic sound devices to create a haunting, melancholy mood in “The Raven.” Descriptions like “midnight dreary,” “bleak December,” and the raven’s “ghostly,” “grim, ungainly, ghastly, gaunt” form fill the poem with cold, shadowy visuals that make the speaker’s grief feel suffocating. At the same time, Poe layers alliteration, assonance, and consonance—such as the echoing “napping, nearly napping” and long “o” sounds—to give the lines a slow, mournful, almost musical rhythm. Repeated sounds, internal rhyme, and onomatopoeic words like “rapping” and “tapping” draw readers into the speaker’s obsessive thoughts, intensifying the eerie, oppressive mood.