Nobody sees the same movie. I'm sure there are people who saw Butch Cassidy and the Sundance Kid and thought "Finally a gay movie about men who really care about each other. Thank God!" That's not what I saw necessarily but I don't think any two people see the same movie.
The book is finished by the reader. A good novel should invite the reader in and let the reader participate in the creative experience and bring their own life experiences to it, interpret with their own individual life experiences. Every reader gets something different from a book and every reader, in a sense, completes it in a different way.