An old zig zag split rail fence is located in Nathaniel Greene Park. These were easy to build and stood up to weather well. I say easy to build, I don't know if I would want to be the one splitting the rails.
Fences are a human's way of marking his (or her) territory. I put "her" in parenthesis as I think the fence is more of a male thing. Futurist Faith Popcorn (what a name) states that future homes will be walled fortresses with security cameras and all. Sounds exciting huh?