How does Bob Woodward use imagery in All the President's Men?

Imagery:

"This picture of the White House was in sharp contrast to the smooth, well-oiled machine Bernstein was accustomed to reading about in the newspapers—those careful, disciplined, look-alike guards to the palace who were invariably referred to as "The President's Men.'"

"John went in and said, 'Mr. President, there is a cancer eating away at this office, and it has to be removed...'"