UX: Urban Experiment. 

I would love for this to happen in Detroit.  A great way to repair the parellel between Paris and Detroit.

“UX members have carried out shocking acts of cultural preservation and repair, with an ethos of “restoring those invisible parts of our patrimony that the government has abandoned or doesn’t have the means to maintain.” The group claims to have conducted 15 such covert restorations, often in centuries-old spaces, all over Paris.”

The New French Hacker-Artist Underground | Wired Magazine | Wired.com http://www.wired.com/magazine/2012/01/ff_ux/