Final answer:
John Keats' 'The Fall of Hyperion: A Dream' consists of two cantos; the first is lengthy while the second is significantly shorter, reflecting the poem's unfinished state.
Step-by-step explanation:
The poem “The Fall of Hyperion: A Dream” is an unfinished epic poem by John Keats. The structure of the poem consists of two cantos, with the first being substantially longer than the second. The poem's fragmented nature has led scholars to discuss its incomplete state, with the first canto containing a more detailed narrative and the second canto being abruptly shorter, reflecting the interruption of Keats' work for reasons that include his failing health. Keats' work often features complex rhyme schemes and stanzas, as seen in his other poems like “Ode on a Grecian Urn” and “The Eve of St. Agnes.”