Thanks Lynn – always appreciate your comments and your interpretations! Your comment about the tree trunks was interesting as I had assumed these would be all around the world (maybe not?) – they are sheets of metal that are placed around the trees to stop possums from climbing them.
Timothy Moss 
Coming back to this one, I love the synergy between the sidewalk and whatever is covering the tree trunks, and the wall, too.
Thanks Lynn – always appreciate your comments and your interpretations! Your comment about the tree trunks was interesting as I had assumed these would be all around the world (maybe not?) – they are sheets of metal that are placed around the trees to stop possums from climbing them.