In Ray Bradbury's Fahrenheit 451, Granger is a member of a group of rebels who seek to preserve books and knowledge in a society where books are banned and burned. His comment about building a mirror factory refers to the idea that books serve as mirrors for society, reflecting its values and flaws. He argues that without books, society loses its ability to self-reflect and improve. By building a mirror factory, Granger is advocating for the preservation of books as a means of preserving society's ability to understand and improve itself. He implies that without books, society will become stagnant and unable to progress. Additionally, it suggests that books are not just a source of entertainment but also serve an important function in society