it's called minimalist art and it's message is basically you can make something from so little effort.
that's literally the message in every piece.
and these aren't the only ones, there's a "painting" that's literally just a blank canvas. like there's nothing on it, it's just blank and it's worth millions of dollars like
and some dude makes these smaller canvases with a bunch of leaves and others with like wet paper and **** like there's no continuity or depth behind them they're so stupid.
personally i don't find any depth in minimalist art, but i've seen more beautiful things and i've traveled to France and ****. so like my mind is already biased on the matter Dx