The Question and Answer section for Extremely Loud and Incredibly Close is a great resource to ask questions, find answers, and discuss the novel.
Sorry, I have not seen the film yet.
The story of the Sixth Borough, which Oskar was told by his father, is a testament to optimism and hope.... something Oskar needed in the wake of 9/11.
Oskar's quest is to discover the meaning of the word "black' and a use or lock to fit the mysterious key. His purpose is to forge a bond with his father.... one last experience.