Life is like the reincarnation of the universe. All things are connected by rebirth, just like the cycle of individual souls. New life replaces the old life, and what really matters is the present moment.

In the novel, SPARK is both a bystander and a symbol of life and civilization, showing the fragility and tenacity of life. SPARK changes over time, and the story ends in a cycle, which is a metaphor for the cycle of life and everything in it.