Quiet or sober refinement, or subdued taste, characterized by humility, restraint, simplicity, naturalism, profundity, imperfection, and asymmetry emphasizing simple, unadorned objects and architectural space, celebrating the mellow beauty that time and care impart to materials.
Belief that each meeting should be treasured, for it can never be reproduced.
Broken tea bowls are painstakingly repaired using lacquer, powdered gold. Used mainly in November, when tea practitioners begin using the ro, or hearth, again, as an expression and celebration of the concept of wabi, or humble simplicity.
Study is through observation and hands-on practice. Students do not take notes, and some schools discourage note-taking.
Taken from Wikipedia, Japanese tea ceremony.