Answer:
In the first two lines, Sandburg introduces the subject and includes a strong metaphor throughout the poem. The arrival of the fog gives the reader the impression that it's slowly moving towards us. The use of the word "little" in "on little cat feet" emphasizes the fog's sneaky and quiet arrival. The metaphor of fog looking catlike lets you imagine the fog sprawled out on the harbor and city much like a cat. The break between lines brings feelings of anxiety as you don't know what the fog will do next. Them comes a sigh of relief as the fog moves on as said in the next line.
Explanation:
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