The prairie is not monotonous. Prairie grass grows to different heights. Wind bends grass east in fall, south in winter, north in spring.
Hills roll up and down.
Sometimes there is no grass. One day I saw a man walking through a grassy field until he reached the next field when I saw his dog running beside the horse the man was riding. The wind blows all directions in summer. Sometimes it doesn't. When farmers burn fields and ditches, there is no grass.