I would like to add this as a comment to the Post by Patrick
“We must construct as well as destroy”
FREE REPAIR
Roland Roos repairs broken, displaced or damaged things in public space. Each repair is intended to restore a particular detail to its pre-damaged state. Before and after the repair a photograph is taken of the unsolicited assignment. The photo taken before the repair is the only existing document of the damaged objects and thus becomes a unicum. All of these unicum photos are on sale for 320CHF each which is the average amount of money that is spent for one repair (materials and labor).
Free Repair was a two year long project. It ended in april 2010.
http://www.rolandroos.net/index.php?/free-repair/
 Pictures and text taken from the web page of the artist: http://www.rolandroos.net/index.php?/free-repair/