What is one way in which edgar allan poe creates a unity of effect of longing in the raven ?

Edgar Allan Poe creates a unity of effect of longing in the raven  with the picture of Lenore on the wall.

The Raven" is a narrative poem by American writer Edgar Allan Poe. The poem is characterized by its musicality, stylized language, and supernatural atmosphere which made it distingished. The story focuses on a talking raven's mysterious visit to a distraught lover, tracing the man's slow fall into madness.

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