an unusual planter for native species

Walking down a local lane, I chanced upon a parked-up vehicle that has been colonised by the brambles of summer. Here's a couple of nice views of it:

I'm quite pleased by the pleasant sense of the human world sinking back into the green, though I wonder if someone is going to get back after a long summer holiday and blow their top. There's a reason brambles are nicknamed mile-a-minute after all. This might only represent a few week's growth!