Answer:
the answer is the visual sense, that is the sense of SIGHT.
Explanation:
The fog comes
on little cat feet.
It sits looking
over harbor and city
on silent haunches
and then moves on.
Sandburg describes the fog visually with “little cat feet” and “silent haunches” making his audience picture the fog, metaphorically, as a cat.
While reading the poem, you can almost feel the fog too. The metaphor of the cat creates an imaginary image in one's head.