This was an unusal find in the middle of a forest. It is an old brick from the base of a demolished Nissen hut that was erected during the second world war (Harewood Forest was a munitions store during the war). The twig tothe top right was lying over the brick when I found it, but other that that I haven't modifed the location in any way. The moss is nearly 1.5cm deep all over the brick.