How does Tim O'Brien use imagery in In the Lake of the Woods?

Imagery:

"From the bottom of the lake, eyes wide open, Kathy Wade watches the fish fly up to swim in the land of sky blue waters, where they are pinned like moths to the morning moon."

"She enjoyed her morning stroll, the solitude and fresh air, but even then she conceived of nature as a department store with potted trees and a gigantic glass roof."