In the midst of instability?

Piled some piece of distorted stones form a perfect figure of lantern in the ancient Japanese garden covered with green moss, it's a scenery of Ohara Kyoto "Sanzen-In" the other day.

Rather than stones that have been precisely measured and shaped, rather than those that have symmetry or consistency, stacks of irregularly shaped stones create a sense of calm and stability in the midst of instability. What on earth is this? 

In the afternoon sun, I felt deep doubts and was impressed so much.