Teorema is a project on Turin, Prague and Lyon, three European cities that in the esoteric tradition are connected in a sort of magic triangle. The project began with a reflection on the theme of the urban nocturnal 'view'. These city glimpses, captured by the camera, seem to want to join together, to form a single image in which the compositional elements, the aesthetic aspects of an interior, emerge with force. They are therefore the principles of interior views, not the traditional views of landscape, to hold this photographic project, indicating the possible meanings.