Walls seem very popular these days. I mean, why not? They are so versatile. The keep things out and stuff inside, you can sit on it and you can paint on it. Four of them make a shelter if you put on roof on top. So ya, walls can be great. I like this kind most. Mostly build by Mother Nature, very pretty and useful (there live things in green walls).
Often, on our walkies, I try to imagine how our area must have looked before we humans got here. You know, no streets, no houses, nobody screwing around with nature. This comes pretty close I think.
Somewhat Patchy 