I don’t define it. I don’t try to define aesthetic quality or what it means to create something, nor do I think “art” = “what I like” and “non-art” = “what I don’t like.” A lot of words have been spent on this subject over the centuries, and I don’t know of any that have closed the question.
What I do think is that there are big broad expanses of things that we can pretty much agree are art (the paintings of Rembrandt, the music of Mozart) and others that we can agree are not art (mayonnaise, a sandy beach, an office building, an amoeba), although in some cases artistry may have gone into their creation. I love cheese, but I don’t consider it art; however, there is an art to cheesemaking (and we obscure our distinctions when we subtly shift the definitions of words to fit various contexts).
Where we run into questions and conflicts is when we try to define an exact line that separates what is art from what is not art. It’s the gray area in between that perplexes us. People will draw the line in different places.
I say it doesn’t matter. We also have trouble stating precisely where the line of demarcation is between seashore and nonseashore, between sleep and nonsleep, between food and nonfood, between chair and nonchair. For most purposes it’s simply unimportant. We aren’t writing dictionaries or interpreting laws; or if we are, we’re employing words to a purpose that may serve some pragmatic need but will not enhance our understanding of art.
If I say something is art and you say it isn’t, what difference does it make? I honestly don’t care if you agree with me or not unless we’re judging a contest together.
But without defining it, I think I can describe art a little bit.
One thing I do think is that art in some respect man-made. Even scholar’s rocks, naturally occurring rock formations, become a human product when they are selected, placed on a pedestal, and displayed.
Art has boundaries. It has a frame, or a performance space, or a beginning and end, or dimensions of volume, or an interval of time, or some other definable limitation. If something is infinite or unbounded or endlessly mutable, it is not art.
Art is perceived. If it is not accessible to the human sensory apparatus, it is not art.
And something can, of course, be all those things and not be art.
Finally, I think something can be art at one time and not at another.
That gray area—it’s very broad. So much the better for art.