Inception is about people who can modify other people's dreams. One of the dream changers keeps unintentionally bringing his dead wife into the dreams. He tells her that he can't live the rest of his life in the dream world with his imagination of his wife:
I can't imagine you with all your complexity, all your perfection, all your imperfection. Look at you. You are just a shade of my real wife. You're the best I can do; but I'm sorry, you are just not good enough.