What is the main conflict in The Songlines by Bruce Chatwin?

THE SONGLINES records the visit Bruce Chatwin makes to Australia as a student of cultures, languages and the evolutions of humanity in all its forms. He has come to study the Aboriginal Songlines out of a fascination that began in his childhood with Aboriginal culture and an adult fascination with their similarity to other transient people groups, having studied Bedouins, gypsies, and the writings of several thinkers who believe walking the earth is the way men are best suited to experience it.