posted on Aug, 5 2011 @ 08:41 PM
I would have to call both these man made. Look close at the first link, you can see the walk through lines in the sections. hard to get from point A
to point B without maikng a trail, all be it small.
The second link has two flaws in the diagram, attention to details.
Ya gotta be really bored to go out in a field and make these. Im not saying they are all man made. Some are far too complicated for two guys and a
peice of cardboard. Interesting hobby I guess.