L' UX, for Urban eXperiment, is a Paris based clandestine organisation whose goal is to use, improve and restore the hidden and abandoned sides of urban inheritage.
This organisation is divided into numerous independent teams: the well known ones beiing The Mouse House (an all-female team), La Mexicaine De Perforation and The Untergunther.
In 2003, La Mexicaine De Perforation introduced the projection room of La Cinémathèque Française and done the Session Comoda film festival.
In 2004, fed up by the bad odors let by the day time spectators, La Mexicaine De Perforation built Les Arènes de Chaillot, a 400 meter square all equiped cinema, located right under the previous projection room, and done the Urbex Movies film festival.
In 2005, the Untergunther infiltrated the Panthéon of Paris and, in 2006, with the help of the professional clockmaker Jean-Baptiste Viot, started to restore the abandoned monumental 1850 Wagner clock before its irreversible state of defacement.
Never caught, upon completion they announced their work at a meeting with the director of the Panthéon who called the police.
Charges were brought against four members but, at trial, after twenty minutes deliberation, the judge ruled in favor of the Untergunther.
The members of L'UX are largely secret, but its spokesman is Lazar Kunstmann who just published La culture en clandestins. L'UX relating 25 years of clandestine cultural actions. 

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