Ever the fun debate, and that is before you get into the collaborative discussion (see "auteur theory", or why a film is made sometimes by thousands of people yet most only care about the director, also one of the things some ponder in the "are computer games art?" discussion).
Art is an effort to stimulate the senses beyond the natural and mundane, evoking emotions and getting people to contemplate events and ideas being the main domains of it*. Whether and to what degree that effort has to succeed in that, or indeed the goals of the artist, however provides the scope for endless debate, and while I excluded the natural and mundane earlier it never the less forms something frequently contrasted or juxtaposed, as well as inspiring art (I might be able to elaborate on lowest energy concentrations, gravity, mechanical strengths of things, evolution, prime numbers and more for why spirals and certain patterns appear in nature but that can matter little, possibly even less if the artists had no clue about that).
*the classic "trivium" in education is grammar (how to write), logic (how to avoid fallacious argument and back things up) and rhetoric (how to take the other two and make them persuasive to people that don't operate on pure grammar and logic in most instances -- humans still very much being seriously governed by the savannah dwelling ape instincts, as well as being very flawed biological beings
https://www.livescience.com/33664-amazing-optical-illusions-work.html ) would also follow that art can be a brutally effective means of this where a thousand pages of text might fall short.
If I was going to go anywhere next it would probably be a discussion of transience and permanence, and how tech might change aspects of that (I can watch a play that happened 50 years ago, or a song, though I can also watch a play written thousands of years ago so that means something in that discussion).