Yugen (yoo-gehn) n. (japanese)
An awareness of the universe that triggers emotional responses too deep and mysterious for words. It is at the core of the appreciation of beauty and art in Japan. It is the subtle and the profound.
The Japanese aesthetic is a set of ancient ideals that include wabi (transient and stark beauty), sabi (the beauty of natural patina and aging), and yūgen (profound grace and subtlety)
Yūgen suggests that beyond what can be said but is not an allusion to another world. It is about this world, this experience.