What is the climax of the book?

The third movement focuses on his learning to understand other people, not only his parents but youngsters like Meyer, with whom he assumed he had nothing in common. It turns out that Meyer can take an interest in art if he is given help and direction. Similarly, Peter discovers that Mom and Dad can understand him if he expresses his ideas in terms to which Mom and Dad can relate. His parents are not dullards; they figure out all that Peter says with his show once he takes the time to create a show that respects his parent's ability to think. Peter can no longer claim that his parents do not understand him; by understanding Mom and Dad, Peter helps them to understand him. They even pick up on the idea that Peter will no longer have "feelings" about the future.