its a theme am not sure ;
The raven represents his sorrow for his wife who passed away. It's on his door it won't fly away aka his sorrow no matter how hard he tries it will always be there bugging him "knocking at his door" well that's my guess anyways I'm only a middle schooler so maybe I'm wrong. Hope I helped!
The raven in Poe's poem symbolizes the speaker's enduring sorrow after losing his beloved Lenore. Its constant presence signifies that this grief is unending and inescapable. Thus, 'still is sitting' emphasizes the permanence of sadness in the speaker's life.
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