We were in a central European forest last weekend and discovered a few places where a bunch of sticks were leaned against a tree. They build kind of a circle so that it looked like a small hut. However, this can't be the purpose of them, cause they weren't pretty close to each other (so they are holey and thus wouldn't serve as a roof).
I've made a little sketch (wasn't able to take a photo :/):
There were quite a few of them. We've discovered at least three.
What's the purpose of such "buildings"?
The room "covered" in those sticks was pretty small. So the shelter theory would only work for kids.
As far as I can remember they were leaned against a pine. At least not against a fruit tree.