How does David McCullough use imagery in The Greater Journey: Americans in Paris?

Imagery:

"In the twists and curves of the old Paris one was relieved from the pain of seeing how far one had to go from one spot to another; each tortuous street had a separate idiosyncrasy; what picturesque diversities, what interesting recollections—all swept away! Mon Dieu! And what for?"

"The idea of it is to dance as wildly, as noisily, as furiously as you can; expose yourself as much as possible if you are a woman; and kick as high as you can. . .Heavens!"