The rhyme scheme of this poem by Leonard Rebello is, as the previous educator said, irregular. For the first half of the poem, he uses end rhyme in every other line, but does not repeat the same rhyming sound, so we see: A B C B D E F E. Then, the amount of rhyme in the poem intensifies somewhat, as we see a GHGH rhyme scheme appear, where the first line of this section rhymes with the third, and the second line rhymes with the fourth. This happens only once, and then the poet returns for four lines to the original poetic structure, where the second and fourth lines of the quatrain rhyme, while the first and third do not. Finally, the poet employs an entirely different kind of rhyme in his final quatrain—in reality, not rhyme at all, but pararhyme or assonance, where the vowel sound of a word is similar to that of the one with which it is paired. In this case, there is assonance on "heart" and "dark."