The Grey Men of Grey Mare's Tail

It wasn't until I read Wildwood that I became aware of the existence of Green Men - the faces of leafy men carved into wood, with paganistic meanings and variations on the theme individual to each sculptor.

http://commonground.org.uk/portfolio/trees/

At Grey Mare's Tail in Dumfries and Galloway, someone has created the stone version. The Grey Man.

I'd love to know who, and why. Probably done on commission to the Forestry Commission, as part of their recreational side of Galloway Forest Park, the romantic in me instead likes the idea of an artist who just wanted to make an unobtrusive, secret statement. To carve faces into stone, and then set them in the stone walls of ruined mining buildings, noticed only by a few people wandering through and careful enough to realise that the stones aren't quite natural. A short-lived artistic statement, like Richard Long's work; faces that gradually become weathered and lichen-clad, until no longer recognisable as any different to any other rocks.