I found this link a few days ago and it seemed silly originally but then not so much after considering it for a bit. A person could do this to a lesser or greater extent but would need to place it between trees or continue a log pile on either side to pull off the effect. At least I certainly have never seen large logs piled so perfectly! It could be built in different sizes as a cache, temp shelter, or whatever. It may be the girl in me, but I like it!

http://www.impactlab.com/2010/01/17/not-your-ordinary-log-cabin/