The following descriptions do not represent the central image of the excerpt from "Kubla Khan":
<em>A worker cutting the grain in the field.</em>
<em>The earth clad in woolen pants.</em>
The central image that the excerpt represents is one of a river bursting forth from the earth as well as hail ricocheting off of the ground. The whole excerpt is talking about how the rives comes rushing down, lie something that is created at each new moment. The main focus of the whole excerpt is the power and strength of the water and how it moves.