Leonhardt uses the example of water circling around a stone.The water flows in, swirls(4) around the stone and then leaves as if nothing was there.

• 莱奥哈德用水绕过石头的例子来说明：水流遇到石头后会自动分流绕过石头，之后再汇合，犹如什么都没有遇到过一样继续前进。