 Aristotle's writings on metaphor constitute a "substitution view" of metaphor, wherein a metaphor is simply a decorative word or phrase substituted for a more ordinary one.This has been sometimes called the "Traditional View of Metaphor" and at other times the "Classical Theory of Metaphor".Later in the first century A.D., the Roman rhetorician Quintilian builds upon Aristotle's earlier work of metaphor by focusing more on the comparative function of metaphorical language.