I really enjoyed this one. It was very strange, and some of the transitions were jarring between different sections of the book. Every time I thought I knew what was going on, or was starting to develop some theory of what was going on, the book just totally departed in a way that made my previous theorizing completely pointless. The ending was, in some ways, unfulfilling. But I think that that was par for the course of the book, not in a bad way, but in the sense that the truth of the book, the objective reality of it, by design does not exist. Was anything that the character experienced actually real? Did the character, in fact, return to "the real world" at all, or merely to seemingly identical copies? Is the character dead? Has the character been dead? The point of the book is that we take reality for granted. Seeing is believing. But what if one day everything we knew changed? What if the core assumptions that we take for granted turned out to be wrong?
This is a hidden gem of a book. It's hard to find any analysis or discussion of it. That makes me somewhat sad. I'd love to discuss this book with others and see what theories or analysis they have to offer!