Circle Of Stones

I think this must be a permanent sculpture in The Orchard of Jesus  College, as I can't find out anything about it. It was tucked away under some trees and not in the 'Sculpture in The Close' brochure. The exhibition ends on the 17th of this month, but there are many pieces of art that are on  permanent loan.  The large stone in front doesn't look as if it fits in with the others. Maybe that's the point of it !