Now, this is real embarrassing!
I seemed to have missed this old thread of Walter's. Just recently, I read something of this artist, and was impressed. I checked out his website and looked at all his works.
In my town, we have a fair number of wall murals. Here's an example. the entire mural isn't shown. It's the wall of a car dealership that has this great 3-D-like mural painted on the outside. The upper edge has been made to look like a castle. It's only when you get closer you can see the individual cement blocks where the painting is.
