Set in concrete ...
We'd stopped to look at the view - the hills of Arran in the distance, over a field with distant sheep, the clouds that were probably going to bring rain out to the west - when we noticed the top of the dry-stane dyke just in front of us. Clearly some dry-stane dyker with a sense of humour had set a boot, or the sole of a boot, in the concrete and stone topping of the wall - or had he?
Nightmare visions of a body suspended below the boot flashed briefly. But no - the wall had holes in it, gaps and irregularities. No body space.
It did make me laugh, though.