From Zen and the Art of Motorcycle Maintenance (Robert Pirsig):

"Quality... you know what it is, yet you don't know what it is.:

"Qualtiy is a characteristic of thought and statement that is recognized by a non thinking process. Because definitions are a product of rigid, formal thinking, quality cannot be defined."

"If you can't define Quality, there's no way you can subordinate it to any intellectual rule. The estheticians can have nothing more to say. Their whole field, definition of Quality, is gone."

If one were to subtract Quality from our description of the world...

The fine arts would disappear.

Poetry would disappear.

Sports and games would disappear.

Also...Alcoholic beverages, tea, coffee, tobacco, movies, dances, plays, and parties.

Quality is neither objective or subjective and is neither mind nor matter. It is something else. It is an event. (a trinity of Quality, mind, and matter).