We saw this Andy Goldsworthy installation a while ago when we were in the Lake District in England. I was reminded of how dry stone enclosures can frame things (like this boulder) and make them more interesting.
A computer screen does a similar kind of thing.
If you click on the frame below, you can watch a talk Andy gave about the difference between his permanent installations built in galleries and the impermanence of the work he creates outdoors, and also the use of colour in his work.
It is interesting to hear how a waller (dyker) in the Q&A at the end of the talk 'frames' the question to Andy about his employing wallers better than himself to execute some of his larger dry stone pieces.