But one very good doctor knew the causes of the sick and gave this presentation to each patient: "Every day,take the bus and go to the center of the city to look at the tree. As you approach it,practice breathing in and out,and when you get there,hug the tree,breathing in and out for fifteen minutes,which you look at the tree,so green,and smell its bark,so fragrant. If you do that,in a few weeks you will feel much better.