Here you have one of Ed's temporary stone walls. He just has to lay them up into a wall. Throwing them into a pile is not his style. This wall has had some stones taken to use in another wall somewhere. It has left some of the stones cantilevered in an interesting way. You would think they would tumble down, but the weight of the rock on top, combined with the way stones fit so closely together makes it stay where it is. Gravity is the force that holds a stone wall together. Of course it is also the force that makes a wall fall down.
I love this wall and don't like to think of it as temporary. But, I have it for now and sometimes temporary can be pretty permanent.