I think the problem is that if we start defining art, we quickly get into the territory of having lots of false negatives. There are lots of things that are now

I think the problem is that if we start defining art, we quickly get into the territory of having lots of false negatives. There are lots of things that are now considered art, and are quite enjoyable, that would not have been art in the past. The dogmatic approach doesn't work. However, leaving it completely open lets people do the "lean two sticks together" thing. It can also be much much worse than that. I remember reading about an exhibit someone was doing where they were letting a dog starve over several weeks while on display. The dog died. Shocking? Yes. Art? No. Here's a good working definition of art I like: "Art isn't art until it's sold. Until then it's an obsession and a storage problem." Not saying it has to be actually sold, but if it's something someone would buy, then yes it's art, at least to a first approximation.