Pascoli's poems in Last Voyage illustrate how everything is interconnected through the butterfly effect theory. The theory states that small causes can have large, distant effects, like a butterfly flapping its wings causing a tornado. Pascoli draws connections between life and death, showing how they are dependent on one another. His poems about The Odyssey also highlight cause and effect, but it is impossible to pinpoint exact causes, as one event may have multiple causes, like new grass growing on a grave being caused by the person's death or their birth many years prior.