Poetry and Rhymes

When Carl Sandburg says "the fog comes on little cat feet", what poetic device is it?

More Questions from Poetry and Rhymes
Whose collection of poems is titled "The Princess Saves Herself In This One"?
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What word completes the line "Twinkle, twinkle, little"?
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Whose poem is titled "The Quotations of Bone"?
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Who wrote the poem "Still I Rise"?
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Who was the "Great Grey Poet"?
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Going on a "Ring Around the Rosie" there's a pocket full of what?
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What is the central theme of the epic poem "Paradise Lost"?
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Sometime during eternity some guys show up is the beginning of a poem by whom?
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