Mother Natures fence? or is it art?

Yep,  always  something interesting on our daily walks.  This is a walk we found, for the most part is flat.  We call this walk "Tetons walk"  our dog Teton is 13 years old, her back legs are weak,  but she does love our daily walks. She loves this walk.  I thought the natural pile of branches and trees looks like a wall.