 Because of the varied reception to Kilmer 's poem and its simple rhyme and meter , it has been the model for several parodies written by <unk> and poets alike . While keeping with Kilmer 's iambic tetrameter rhythm and its couplet rhyme scheme , and references to the original poem 's thematic material , such parodies are often immediately recognizable , as is seen in " Song of the Open Road " written by poet and humorist <unk> Nash : " I think that I shall never see / A billboard lovely as a tree . / Indeed , unless the billboards fall , / I 'll never see a tree at all . " 
