I love this topic, it's really fun to ponder about because art is so subjective that it can barely be quantified beyond the most basic premise of: the expression of an artist
Really anything can be considered art. (since music is my main form of artistic expression, I'm gonna use music as a basis for the rambling) A really good example is John Cage's composition 4'33" which is a piece that is played differently every time. It can feature any number of performers and they are instructed to not play their instruments. The idea behind it is that all sound is music in a way. It really depends on a matter of perspective. I don't entirely agree with his view, but I think it's a really interesting take on the world around us; rather than the performance informing the experience, the experience is in itself a performance. The act of hearing a member of the audience cough or the rustle of clothing as someone shifts in their seat, that is the art. The world around us is, in its own way a work of art (Of course, this could be taken to have theological meaning, the world being a work of art created by a higher power, but that's a little different), would you say a bird is not capable of singing simply because its song doesn't conform to human musical norms? Or is it a form of art because it is interpreted as art? The question if this sort of art is "good" or not is another thing, but I've lost most of my original train of thought, so Imma stop rambling now
Art is very cool