They’re hiding.
The sniper is straight up from the big boulder in the lower left corner, where the color of the stones changes from light to dark.
“The key question for me and my work at the moment is, how images are used to influence people and their decisions,” Menner wrote. “At the core, hiding snipers and ads for Apple have something in common, since both try to infect us with ideas about things we are not able to see. But I think that this is easier to detect while ‘looking’ at hidden snipers than by looking at Apple ads.”
Observing Hermann 
Like our favorite “Feldwebel”, Sergeant Schultz, “I see nothing, nothing!”
I found slightly over half of them. But I don’t find it “fun” looking for them — I find it creepy and terrifying and paranoia inducing.
I feel good about myself — I found them (some were harder than others, admittedly).
Of course, training helps — and my dad was a sniper, my husband was a Ranger, and my kids were/are in SF units, and I hunt (it helps in finding when you’re already thinking — where, and how, would I hide?).
And it was fun to go looking for them — because I’m strange like that.