How does Harold McGee use imagery in On Food and Cooking?

Imagery:

"The oceans are voluminous and ancient, the 'primordial soup' in which all life began, and in which the human imagination has found rich inspiration for myths of destruction and creation, of metamorphosis and rebirth. The creatures that live in this cold, dark, dense, airless place are unmatched among our food animals in their variety and their strangeness."