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
What word completes the line "Twinkle, twinkle, little"?
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Which of these is the name of a cat in a poem by T.S. Eliot?
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How did the poet Robert Frost's son die?
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What happened to the 2 grey kittens and their mother?
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When "London Bridge Is Falling Down" why can't they build it up with pins and needles?
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In the song "There was an Old Lady Who Swallowed a Fly" what animal finally killed the old lady?
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Who put the cat in the well in the nursery rhyme "Ding Dong Bell"?
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Who wrote the poem "As Soon as Fred Gets Out of Bed"?
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