[groby_b]

If they are "indistinguishable" from those book covers, I strongly suggest visiting an optometrist.

You may not enjoy modern art, and that's fine - but most of it runs circles around modern book covers. The latter are optimized to grab attention, without any artistic merit. They're the equivalent of shouting loudly.

Modern art may be the equivalent of speaking in esperanto or lojban to you, but at least it's still trying to say something.

[like_any_other]

No, luminism and romanticism are the equivalent of esperanto or lojban. Modern art is pre-verbal vocalizations, after it had deconstructed language because having syntax and pronunciation are unoriginal and "academic", and fooled itself that higher language is no longer worth exploring. What is it trying to say - how severely language can be mutilated while still sparking some semblance of an idea in a sufficiently imaginative listener? Glorified Rorschach blots. I'll let MoMA make my case for me:

https://www.moma.org/collection/works/79892

https://www.moma.org/collection/works/101471

https://www.moma.org/collection/works/81527

https://www.moma.org/collection/works/35054

https://www.moma.org/collection/works/79816

https://www.moma.org/collection/works/35548

https://www.moma.org/collection/works/80712

https://www.moma.org/collection/works/32293

https://www.moma.org/collection/works/232

[groby_b]

I mean, let's take the easy lay-up - why Mondrian's "Composition No. II, with Red and Blue" actually is a very important painting: (https://www.moma.org/collection/works/79816 from your list)

- It's a major transition point in abstract art, moving from painting that still have an echo of representation to the purely abstract. You might not like it, it's still an important part of art history. It's talking (with fairly sophisticated language, if you're able to listen) about art in and of itself. About the removal of nuance in favor of structure. About the use of white space.

- It influenced and shaped modern architecture, via Bauhaus and "International Style" skyscrapers. That painting (and Mondrian's approach) shaped every major modern downtown, to some extent.

- It's the precursor of the entire field of graphic design.

Again, you may not like it. Art has always been in the eye of the beholder. You may dislike what it says. But it does say a lot, clearly and in a well thought-out way.

It says even more if you see it in the context of his earlier tree paintings. For folks who care, a rough sequence:

- https://en.wikipedia.org/wiki/Evening;_Red_Tree

- https://www.piet-mondrian.org/the-gray-tree.jsp

- https://www.piet-mondrian.org/the-flowering-apple-tree.jsp

- https://www.moma.org/collection/works/79816

(Most art gains if you see it in the larger context of the artist's work. Most modern art exhibitions fail to make that clear)