The modern city always exerts a semiotic bombardment: we are surrounded on all sides by a pictographic labyrinth, whether in notices, posters, graffiti or advertising. But with the use of digital cameras and GPS receivers, this bombardment can be turned into a tool for creativity, for the pursuit of chance associations and synchronicities. In Signs of the City, teenagers and young adults in Barcelona, Berlin, London and Sofia do just that, with the aid and encouragement of professional artists. The book is the result of a project that lasted one year, incorporating workshops, online...