Final answer:
The symbolism in the passage portrays the evening as a patient etherized upon a table, conveying stillness, helplessness, and passivity, setting a surreal and uneasy mood that hints at themes of paralysis and existential dread.
Explanation:
One purpose of the symbolism used in this passage is to depict the evening as a patient etherized upon a table, reflecting a sense of stillness, helplessness, and passivity. The comparison sets a tone of surrealism and unease, establishing the mood of the narrative and hinting at themes of paralysis and existential dread present throughout the poem.
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