It has to count as the best thing I’ve pulled out of a skip: a piece of Irish limestone, a slab about three feet by one foot by three inches thick. There are no rough surfaces – it’s sawn on six sides – though there are a few chipped edges. Admittedly this is high-end skip-diving, at a monumental mason’s yard, having asked for permission to go through their offcuts – plenty of broken marble and Portland, but only one piece of Kilkenny. It takes a fair amount of shifting of the overburden to reach it, the single pale grey corner that initially caught my eye gradually increasing in size as I get closer. I have to gradually walk it up the spoil to get it out. I can just about lift it. It’s not a perfect rectangle, one of the ends is at a slant and there is a vent along one side, presumably the reason why it was discarded in the first place. Otherwise it’s a good find.