THe imagery in the poem is rather abstract. Throughout the poem, the speaker addresses the unknown poet in a conversational tone, calling him "you." Details of the poet's visit to the speaker's house aside, the unknown poet in this poem is representative of unknown poets everywhere. In this way, the address of the poem is an apostrophe. An apostrophe is a figure of speech in which the speaker addresses someone as if he were physically present, but is not. Apostrophes are often used to address abstract ideas as well, for example when Thomas Hardy addresses love in his poem "I Said to Love."