From what I've read, Rob91 doesn't do much in the way of PP. He shoots 'em that way - or at least that's my understanding. Somebody correct me if I'm wrong (wouldn't be the first time).
And you know what, it's not a shot that I'd hang in my home, but I find myself smiling when I see there's a new post in this thread, 'cuz I get to look at it again and try to figure it out. (Now, "yellow tree", there's something I'd hang in my home. And I'm not even kidding).