As we dialogued on a sunny early October day, the tall cedars outside were gently waving in the breeze. Every branch was in motion, and the trees were swaying back and forth, glistening in the bright sunlight as they did so, creating ever shifting patterns of light and shadow. Dr. Sen pointed to the unceasing motion visible through the room's large windows, saying that like the breeze and the branches, the Way of Tea “follows nature's path: it is a flowing which is not obvious." It is called furyu. Fu means “wind,” and ryu means “to flow”: “this suggests that our spirit should flow through life like the wind that flows through all of nature”.
from Robert Edgar Carter, The Japanese Arts and Self-Cultivation