In his poem Fog, Carl Sandburg used personification. He did this by describing the fog as a living thing that has a will of its own and wants to stop people from driving cars. Personification is when a inanimate object is described in terms of a human being. For example, a river is not described as having a will of its own, but rather as a "force of nature". However, a force of nature does not think of itself as beautiful or ugly. A river may be described as "graceful" or "powerful", but never as "beautiful" or "ugly". So, the fog is described as having a will of its own because it tries to block out the sun with its hands. It is also described as "graceful" because it covers up the earth's beauty with its white blanket. The last figure of speech used in the poem is hyperbole. This means that something is said in a very strong or large way for effect. For example, the poet could have said that the fog covered up the earth with its hand, but instead he chose to say that it covered up the earth with its whole body.