This is a tangential point, but I've recently noticed that I discover a lot of art through wikipedia. Many pages that deal with abstract concepts are illustrated with wonderful and varied selections of art, e.g.
That is indeed beautiful but also a sad reminder that current copyright systems have frozen this situation in time - we can only ever use antique art freely in this way, and all recent art is locked behind pseudo-immortal copyright terms.
https://en.wikipedia.org/wiki/Justice https://en.wikipedia.org/wiki/Love