What is the theme in Extremely Loud and Incredibly Close by Jonathan Safran Foer?

Another theme in the story is writing. Extremely Loud and Incredibly Close is filled with writing. A few weeks after the "worst day," narrator Oskar Schell begins writing letters to people to "lighten his boots" (make himself feel better), including astrophysicist Stephen Hawking, Beatles drummer Ringo Starr, and researchers Kaley and Goodall. He receives responses from them, surprisingly, regretting they cannot accept him as a protégé without more information. On the second anniversary of the collapse of the World Trade Center, Oskar's Grandma writes to him about her life, beginning with finding herself in the position of needing to figure out how to write to a prisoner in a Turkish Labor Camp who writes people at random asking for a reply, a picture, and a name.