You could extract insight from anything, essentially. From reading a news article, having a blister on your hand, observing a toddler. And from art too, of course. But that's not what art is for. — Henri
Well it’s possible that that’s exactly what art is for and anything else is not art.
If a painting is working within the idea of realism, where the painting reproduces the observed accurately, a landscape for instance, then what is the artist really doing? Is that painting really their experience of that landscape, just this artificial reproduction of what was before them? A photo can do that. The post-impressionists and cubists tried to show us that that’s not how we see.
The painting that looks exactly like the landscape the painter stood in front of is not what he was really seeing, that’s not how we look at things, with that passive frozen attitude. Our own sensibility and understanding are always at work as we look, so that reproduction that the artist has made, the landscape, ‘so real’, as people say, is in effect just a painted surface, it’s just something beautiful to look at.
Cubist paintings include all, or many sides, of an object, because we may not see it but we know there is another side to the bottle, or box, or guitar, and we know that we are in the same space, and we know that the object also stirs up memories and emotions at the time of painting. So the painting is the experience of the artist just as it is for us observing something.
That’s how we really see, it’s not just the appearance of things before our eyes. So art does offer intellectual insights.
Some books do this, though they may have other agendas: about memory, or how we I think and act. Some posts here have said film can’t do this as well as books can do, but I wonder if films do do it just as well, in fact so effectively that we hardly even notice it happening.