Exactly what was Ringworld about? I recently re-read this book, and although I enjoyed it the last time, I don't think I really digested it properly. It has occurred to me that I am not really sure what the point of the book was? What was the main story? From Amazon: Is it about the Ringworld? I don't think so - we don't really learn that much detail about the inhabitants or builders of the structure, most of the information is conjecture or supposition on the part of the four aliens that travel there. Is it about the Puppeteer experimentation with the evolution of species, both human and Kzin? Is it about searching for a way to survive the radiation that is slowly working its way towards known space from the galatic core? What do you think?