A metaphor is a figure of speech that compares two unlike things usually using the words "is" or "was" to make the connection. For example, "She is a pig," is a direct metaphor that states what the girl "is". So, whenever you see the words "is" or "was" connecting two different objects or ideas, you can be sure it is a metaphor. However, sometimes poets use implied metaphors to compare two things. One example of a really good implied metaphor is found in Carl Sandburg's poem entitled "Fog" when he writes, "The fog comes/ on little cat feet." Sandburg doesn't say that the fog is little cat feet; rather, he implies that the fog is little cat feet through the use of the verb "comes".