I remember the first time someone tried to get me to see the hidden picture in one of those. I thought they were full of horse fertilizer. I swore it was a scam until I sat down one day and actually figured out the optical illusion trick to see the hidden picture (yours was a horse or unicorn or something like that).
But at least I got it, the modern art scene I never did figure out. Just silly painters splattering paint in my opinion.
About forty years ago Thomas Wolfe wrote a book about modern art called "The Painted Word." After years of going to art galleries and viewing numerous modern "art" works, Wolfe realized he wasn't getting any pleasure out of the stuff he was viewing.
He came to the conclusion that the great majority of modern art was a scam. There was nothing there.
Naturally, Wolfe was condemned by all the effete snobs on the art scene as being a philistine or other nasty adjectives.
I think Wolfe was correct....there is nothing there. Except, of course, a ton of money to be made by the scammers.