The only power source a book needs is you. If you have to leave for a few minutes you have not lost the story. It is waiting for you when you return. You can pick up a book and resume reading at any time, after a few minutes, a few days, even a few years. A television picture or a movie might be lost forever, but your book is waiting.
Louis L'AmourIt is an old custom of these people to pick up a stone and toss it on the pile. Perhaps it is a symbolical lightening of the load they carry, perhaps a small offering to the gods of the trails.
Louis L'Amour