The Nelly Duff blog showed recently the work of Jan Vormann, an artist who travels the world repairing crumbling monuments with Lego.
Instantly familiar, with a little research I disovered that Jan was responsible for the little additions I saw this summer at De Waag (right), a city gate and weighing house dating from 1488 in Amsterdam's Nieuwmarkt.
You can't help but be charmed by the helpful 'Elves and the Shoemaker' thinking behind Vormann's initiative, and by the shots of colour his quirky inserts bring to decaying walls.
The concept is so simple and cheap it's easy to replicate - the Amsterdam campaign was waged by Jan and a group of enthusiastic volunteers. In the time-honoured words of Neil Buchanan: go on - try it yourself!