Final answer:
The poem 'For a Lady I Know' by Countee Cullen employs the literary device of hyperbole to emphasize contrasts and add whimsy to the narrative.
Explanation:
The literary device used in the poem 'For a Lady I Know' by Countee Cullen is hyperbole. Hyperbole is a figure of speech that involves an exaggeration of ideas for the sake of emphasis. In this poem, the exaggerated idea that poor black cherubs rise early to do celestial chores emphasizes the contrast between social classes and adds a touch of whimsy to the narrative.
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