How does Marc Reisner use imagery in Cadillac Desert: The American West and Its Disappearing Water?

Reisner uses imagery to describe Dominy's ambition. he also uses imagery to describe the dams.... majestic and monstrous.

"When visitors were led to the canyon rim to watch Boulder Dam on the rise, there was usually a long moment of silence... that expressed proper awe and reverence for the dazzling, half-formed monstrosity they saw. The dam defied description; it defied belief."