Besançon is the birthplace of utopian socialism : Fourier, Proudhon or Victor Hugo were born here, and, in the 20th Century, huge strikes and social movements tried to implement ideas for a new society. In 2010, I was commissioned by the City to create a work of art in tribute to this historic heritage. I proposed a series of posters that would be installed on all of the city's billboards for a week. These posters expose the theories of Charles Fourier (1772-1837) and the “Théories des quatre mouvements et des destinées générales”. During the day, they show our current society. At night, when the poster is backlit, they show society as Fourier dreamed it. In collaboration with Elsa Maillot.