Rivers appear in eight of Stevens' poems. Those eight poems appear below, along with the appropriate line references. Because of their transitory nature, rivers hold deep symbolic meaning in Stevens' poetry. Rivers are a solid force yet are ever changing and shifting. Because of this, they can represent change, uncertainty, or even powerful intangibles such as the imagination. This idea as presented in Stevens' poetry is reminiscent of philosopher Heraclitus's famous statement "No man ever steps in the same river twice."