Metaphor

Not to be confused with it's cousin, the simile, the metaphor is a statement not meant to be taken literally. It creates a comparison between two nouns by saying that they are the same. For example:

"The moon is a glowing eye, watching the earth intently at night."

The moon is not, literally, a glowing eye, yet by comparing it to one, the reader is given the impression that the moon is like a watchful entity.