I think the best definition of art is that it cannot be defined, at least not a priori.
I disagree, more below.
Which one makes you look at it for a while, makes you think about what's going on, what it's about. And which one makes you look at it, think, "Hmmm, nice colors..." and move on.
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I guess art does have to be intentional to be called art.
Graphics software can take a digital photograph and, using a computer algorithm, turn it into what looks like an oil painting.
Since the program has no consciousness, and therefore no intent, is that art?
I am increasingly of the opinion that the entire "Is it Art?" discussion is a pointless bit of intellectual masturbation, which ultimately detracts from more fruitful questioning.
It is not difficult to define art in this context. To wit, art is simply an indirect form of communication. It requires intent, and it requires something to be communicated. What is being communicated doesn't have to be "high concept", nor does it need to enumerable as a particular "message". It may simply be an emotion, an experience, a feeling, an essense. In fact, the greatest art often communicates things which are difficult, if not impossible, to describe in language. Language and art are two different forms of communication, and some things are more easily communicated in one medium than the other.
A much more profitable question is "Is it good art?" What is being communicated, and how effective is it at communicating? Obviously, the skill and vision of the artist will greatly affect the quality of the communication; and therefore whether the art is good or bad.
This is my biggest issue with the art world today. So much of what is out there isn't even art, since there is no intent, and nothing being communicated (like the stuff in the OP); and so much bad art lauded for qualities other than that inherent in the art, such as the method of creation, the artist's socioeconomic background or ethnicity, the circumstances of creation, political associations, and so on. This is most pronounced with "abstract" art; but occurs in any particular school or style. We've seen an almost complete shift away from the description of art as "good" or "bad", and critiques of the quality of the work and what it communicates; and it's replacement with vague nonsense like "important", "effective", "challenging", "revolutionary", "visionary" etc. All of which raises, or should raise, questions: "Important how, and for what?" "Effective at what?" "What is the challenge?" "What revolution has it created, what is being overthrown?" "What is the vision?" All of those terms can be used to describe good art as well as bad; and the biggest difference between them is that good art embodies the answers to those questions, whereas bad art needs to be explained.
There is no question of art being good or bad, because those qualifications have been mostly dispensed with. If they are used, it's not to describe the quality of the work, but how well it fits in with the viewer's sensibilities and personal agenda: eg, art by "old dead white men" is inherently "bad", and art by a "young feminist African-American portraying the hardship and nobility of her childhood in the ghetto" is inherently "good", regardless of the actual quality of either work.
One of my biggest pet peeves with the art world is the proliferation of the "vision statement"; where the artist has to explain what it is you're supposed to see, and feel, and understand when viewing his art. This is pure garbage. If these qualities aren't inherent in the finished work, then no amount of ascribing such qualities by the artist is going to put them there.
The final straw for me was a gallery show I wandered through, as part of a local "art walk" (a number of local galleries coordinating openings and events on a particular day of the month). The show had this absolutely enormous vision statement posted at the entrance, a long rambling bunch of nonsense about what the artist was "saying" in his work, and how it should be viewed and understood. The art itself was a bunch of small irregular cast-bronze plate of rough-textured squiggles. Like someone had taken castings of random patches of ground, added some semi-random squiggly shapes in vague but highly inaccurate imitations of blood vessels (this is actually how the artist referred to them), did a crude bronze pour over them; and did not manipulate them in any way after pouring, aside from some chemical treatment to get a rough patina (no polishing, shaping, or other cleanup). I couldn't decide whether to be completely disgusted, or to laugh my head off; since this wasn't a little hole-in-the-wall gallery, but one of the largest in town.