The three six-line stanzas of this poem all follow the same rhyme scheme and the same metrical pattern. There are only six rhyming sounds in this eighteen-line poem because the poem rhymes ababab, cdcdcd, efefef . The pairing of two rhyming sounds in each stanza works well because the poem concerns itself with the two forcesdarkness and lightat work in the woman's beauty, and also the two areas of her beautythe internal and the external.