How does Neil Gaiman use imagery in American Gods?

Imagery:

"Chicago happened slowly, like a migraine."

"Odin's Wain, they call it. And the Great Bear. Where we come from, we believe that it is a, a thing, a, not a god, but like a god, a bad thing, chained up in those stars. If it escapes, it will eat the whole of everything. And there are three sisters who must watch the sky, all the day, all the night. If he escapes, the thing in the stars, the world is over."

"... there are new gods growing in America, clinging to growing knots of belief: gods of credit card and freeway, of Internet and telephone, of radio and hospital and television, gods of plastic and of beeper and of neon. Proud gods, fat and foolish creatures, puffed up with their own newness and importance.