The Moonstone Eels is a poetic narrative intended to teach a moral lesson concerning the concept of nature, originating in The Writ of Prodigies. The form guides poets during improvised performances. The poem is three to four quatrains. Use of assonance and symbolism is characteristic of the form. Forms of parallelism are common throughout the poem, in that certain lines often contrast underlying meaning and they have similar grammatical structures. The fourth line of each quatrain must expand the idea of the third line. The rhyme scheme of the poem is AABA.