The memories and physical evidence Felix has of his parents are their stories and memories of them. Also his own imagination of them and his stories about them.

Felix believes that the Nazi will destroy his parent’s books because they destroyed the Jewish books at his orphanage but he does not know about what the Nazi were really doing.

The importance of his notebook is that he always writes his stories in it and that is the only thing that his parents gave to him before they left and he still has it.