Line 47 mentions bowers ("Sunk are thy bowers in shapeless ruin all"); the term is repeated in line 5 ("Dear lovely bowers of innocence and ease"). Why does the poet repeat this image? "Bowers" is the central theme of the poem. The poet is seeking to contrast the present loss with the idealized past The poet is being unnecessarily repetitive. The poet wants to emphasize how rural the setting is.
