The classic Binary Opposition for metaphors. One of the Kinds of Metaphors used by classifiers.
> A Dead Metaphor is a figure of speech which has lost the original imagery of its meaning by extensive, repetitive, and popular usage, or because it refers to an obsolete technology or forgotten custom. Because dead metaphors have a conventional meaning that differs from the original, they can be understood without knowing their earlier connotation. – Wikipedia 
In this interpretation, ordinary language is chock full of metaphors. (Not that this metaphorically compares a language to a container that can hold metaphors and other things. "Chock full of" is a dead metaphor.)
A poetical metaphor metaphor is something like:
> But, soft! what light through yonder window breaks? > It is the east, and Juliet is the sun. > Arise, fair sun, and kill the envious moon, > Who is already sick and pale with grief, > That thou her maid art far more fair than she:
More interesting things are happening here than "I like Juliet". It's saying that, sure, but it's also establishing her as a heavenly being, and it compares her (metaphorical) brilliance to the actual moon, which is "pale with grief" that Juliet outshines it, and so on.
Another example is from Emily Dickinson’s poem that begins:
> Because I could not stop for Death — > He kindly stopped for me — > The Carriage held but just Ourselves — > And Immortality.
It’s not unusual to personify Death, but Dickinson characterizes Death as a gentleman caller who takes the narrator on a leisurely carriage ride to her grave. He’s doing her a pleasant service, which is a different way of thinking about death.
See also Generative Metaphor.