Killy, basically, the walls and whatnot become "your's" in the same way the sheep do. I think that this is a pretty interesting feature. All I tried was deleting. I think it would be interesting to set them up with a gate and see what happens there. What I don't know is if someone else running past the walls will convert the ownership over to them, or if the first person to get the walls gets them for the game. Pretty good reason to send the scouts out, eh?