In 1995, in Chicago, Mary Jacob curated "Culture in action," an experience of participatory Public Art which left a mark on the contemporary artistic research and criticism. Over the last twenty years, this "new genre of public art" (Lacy 1995) has developed. In these "dialogical" and "connective" aesthetics (Kester 1999, Gablik 1992), public artists have involved citizens in creative performances that aim to modify citizens' perceptions of the places where they live, to create new relations within and toward the territory, and to transform (often temporarily) the physical spaces. The book...