David Mitchell's "Cloud Atlas" is a novel that weaves together six interconnected stories spanning different time periods and genres. Each narrative is told in a unique style, ranging from a 19th-century journal to a futuristic dystopian tale. The stories explore themes of reincarnation, the impact of actions across time, and the interconnectedness of humanity. The structure of "Cloud Atlas" is notable for its nested format, where each story is interrupted and resumed later in the book. This innovative approach allows readers to see how characters and events resonate across time, emphasizing the idea that individual choices can have far-reaching consequences in the universe.