How does Bruce Chatwin use imagery in The Songlines?

Imagery:

A tjuringa is usually an oval-ended plaque, carved from stone or mulga wood, and covered with patterns which represent the wanderings of its owner's Dreamtime Ancestor. In Aboriginal law, no uninitiated person was ever allowed to look on one."

"Above all, do not lose your desire to walk: every day, I walk myself into a state of well-being and walk away from every illness; I have walked myself into my best thoughts, and I know of no thought so burdensome that one cannot walk away from it... but by sitting still, and the more one sits still, the closer one comes to feeling ill... Thus if one just keeps on walking, everything will be alright."