Cool Art project in Oslo. This project explores the invisible terrain of WiFi networks in urban spaces by light painting signal strength in long-exposure photographs. A four-metre tall measuring rod with 80 points of light reveals cross-sections through WiFi networks using a photographic technique called light-painting.
To me this is connected to the philosofical concept from Maurice Merleau-Ponty: Phenomenology of Perception, in which the body-subject is an alternative to the Cartesian 'cogito'.
See for more info on the light painting project: http://www.nearfield.org/2011/02/wifi-light-painting