Sometimes, when mountains are weak, they are without fail destroyed by water. It is, in other words, as if subjects had attacked their emperor. A mountain is weak if it does not have stones for support. An emperor is weak if he does not have counselors. That is why it is said that it is because of stones that a mountain is sure, and thanks to his subjects that an emperor is secure. It is for this reason that, when you construct a landscape, you must at all cost place rocks around the mountain.