Metropolis by Marc Morro, Barcelona. Of Fritz Lang's fictional city, Morro says: "If there were any tourists, they would certainly be subject to close surveillance. That’s why the Metropolis souvenir is something that seems harmless to the tourist but which conceals a control system. Whilst the visitor believes he or she is carrying around a miniature reproduction of the most outstanding building in the city (the Tower of Babel), inside the object is a tracking device that shows the location of all visitors to the city at all times, even after they have left."