Thanks. That's a good question. I remember taking an undergraduate course on the philosophy of art, and one of the themes in the textbooks is that there's no consensus on how to define "art." In part that may be because art is dead or rather free of the dogmas that used to constrain our creative impulses. Western artists used to have create to serve the Church. Then came modern art when artists focused on exploring their media. And then came postmodern art, when artists lost respect for all possible metanarratives or grand explanations, including explanations of art. So art is something like groundless, meaningless, free-flowing creativity.

In the philosophy I've been working out since I started writing articles on my "blog" going back to 2011, before I switched to Medium a year or so ago, I extend this boundlessness of art to a pantheistic conception of nature's creativity. Following Nietzsche's impulse, I try to reconstruct morality and the best of spirituality/existential authenticity in aesthetic terms since the latter piggyback on scientific objectivity (both involve personal detachment to see things as they are).

The aesthetic stance focusses on surface features while science and reason look for underlying causes, but both are objective. That's to say the pantheistic recognition of nature's supreme creative power makes for a religious sensibility that's perfectly compatible with science and with naturalistic philosophy.

Anyway, what's art, more strictly speaking, to me? Human art is part of our humanization of the inhuman wilderness. (Nature's creations aren't benevolent, but terrifying and humiliating to vain, clever primates like us). Art is a reflection of our concerns which displace the alien meanings of nature's creations and destructions. Art is subversive, too, as the meanings we create often tear down unwarranted presumptions, such as the received wisdom that transmits so many noble lies. Art externalizes our minds to help us know ourselves. (The perennial philosophy suggests that the natural universe may be a divine mind's similar means of self-reflection.)

Here are some articles of mine that further explore these ideas:

https://medium.com/the-apeiron-blog/hubris-and-alienation-the-roots-of-the-environmental-crisis-28c589ad00c9?sk=1a06b5b72ebd8df39ba91abe2fa3c401

https://medium.com/interfaith-now/the-christian-ethos-and-the-primacy-of-aesthetic-meaning-656817ee6537?sk=130c56c754014424e12840c94e485a1a

http://rantswithintheundeadgod.blogspot.com/2017/12/posthuman-religion-from-end-of-art.html

http://rantswithintheundeadgod.blogspot.ca/2013/11/life-as-art-morality-and-natures.html

https://medium.com/the-apeiron-blog/modernity-and-the-anguish-of-artists-ef7ab7664313?sk=9a9b25f1c868913648b93b3274a32b00