How does Ole Edvart Rolvaag use imagery in Giants in the Earth?

The imagery of Giants in the Earth is rich and varied. Per Hansa was a fisherman before leaving for America, and there are many images of boats and the sea. The fact that the wagons crossing the plains actually were called prairie schooners adds to the power of this image. As Beret's insanity deepens, Per himself behaves "like a good boat in a heavy sea." And on the afternoon of the locust invasion, his sod hut looks to him "like a quay thrust out into a turbulent current."