I don't know how big, or little, this series might be,or indeed how soon the next one will appear. But this is the first, a remarkable find pointed out to me on the 30mph sign painted last year on an approach road into Hallaton in Leicestershire. A stray leaf from a nearby ash tree had obviously landed on the road, and the sign maker just covered it over with his thick white paint. Rain, salt and tyre scuffing did the rest, until the leaf finally disappeared, leaving its ghost made from the tarred surface. So of course I'm now out there seeing if it's happened elsewhere, dodging the traffic and not for the first time on my hands and knees in the middle of the road.