This is one of those things I’ve always wondered in the back of my mind. How far does a WiFi network actually reach and what would it look like? How come I have reception in one spot and not in another? Well a team from Oslo including Timo Arnall, Jørn Knutsen, and Einar Sneve Martinussen set out to answer just such a question by creating visual representations of actual Wifi networks to spectacular effect. Utilizing long-exposure photography and a four-metre long measuring rod with 80 LED light points they were able to “reveal” cross-sections in wireless networks. We built the WiFi measuring rod, a 4-metre tall probe containing 80 lights that respond to the Received Signal Strength (RSSI) of a particular WiFi network. When we walk through architectural, urban spaces with this probe, while taking long-exposure photographs, we visualise the cross-sections, or strata, of WiFi signal strength, situated within photographic urban scenes. The cross-sections are an abstraction of WiFi signal strength, a line graph of RSSI across physical space. Although it can be used to determine actual signal strength at a given point, it is much more interesting as a way of seeing the overall pattern, the relative peaks and the troughs situated in the surrounding physical space. See the full photo set and read much more about the project here.