I should add that it isn't my work :-)
Neat. It would be interesting to see a time-lapse video of the wall as the layers of graffiti accumulated.
Ah... the al frescopainting 'scene' in Wallingford is very under-developed. This is one of the very few stretches of unoverlooked concrete in the town - albeit you need to climb a fence and risk either nettles or a dunking in order to get there. It isn't really in the town either. And there are only certain times of day you can get a decent photo of the whole wall, making time lapse a tricky proposition. Doubtless winter will be quieter but I'll check back in a couple of months to see if there have been any additions.