It's interesting that so many people over the centuries can get deeply emotional and excited about our essence being a NO thing (spirit), and yet we cannot get equally excited about our essence being a SOME thing (material).
Why is material not something to be happy about? Why is material strapped with such disgust in some circles of thought? Why is material not worthy of worship to an equal degree as spiritual? Why is a NOthing elevated above a SOMEthing, when THINGS or STUFF is the human sensory feel of what reality is?
This is the sort of attitude that underlies all my art, ... specifically my various FLUIDISM series, which you can find in my galleries here at FAA.
To stay on topic, then, I can say that art reminds us of our MATERIAL reality and the grand nature of this material. I would say that any spiritual reminders that art might convey, then are delusions that humans read into this art.
Perpetually changing material is the foundation of reality (a foundationless foundation, so to speak), and a real sense of reality is in tune to this perpetuity of change in things. Some people believe that an unchanging essence underlies these perpetual material changes (the spirit), but I suggest that the essence itself is perpetually changing too. This is even more magnificent than an immutable nonbeing, again, in my way of thinking. My fluidism art reminds me of this.