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
How did the poet describe Santa's belly in "The Night Before Christmas"?
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Who wrote the poem "Under the Harvest Moon" in 1916?
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Who marched his men up to the top of the hill, then marched them down again?
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Who went up the hill with Jack to fetch a pail of water ?
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In "Hey Diddle Diddle", what is rhymed with diddle?
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In "Little Boy Blue", where was the little boy sleeping under?
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In "Baa, Baa, Black Sheep", who will not be getting a bag of wool?
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A boy named Kai is one of the heroes of what famous tale by Hans Christian Andersen?
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