In Zen philosophy there are seven aesthetic principles:

Fukinsei (不均斉): asymmetry, irregularity;

Kanso (簡素): simplicity;

Koko (考古): basic, weathered;

Shizen (自然): without pretence, natural;

Yūgen (幽玄): subtly profound grace, not obvious;

Datsuzoku (脱俗): unbounded by convention, free;

Seijaku (静寂): tranquility, silence.

Each of these things are found in nature but can suggest virtues of human character and appropriateness of behaviour. This, in turn suggests that virtue and civility can be instilled through an appreciation of, and practice in, the arts. Hence, aesthetic ideals have an ethical connotation and pervades much of the Japanese culture.

Ref: Wikipedia

Graphic: Steven Savva