Invisible Network

The city is filled with an invisible landscape of networks that is becoming an interwoven part of daily life. WiFi networks and increasingly sophisticated mobile phones are starting to influence how urban environments are experienced and understood. The creators, Timo Arnall, Jørn Knutsen and Einar Sneve Martinussen are exploring the immaterial terrain of WiFi looks like and how it relates to the city. See more;

"The measuring rod is inspired by the poles land surveyors use to map and describe the physical landscape. Similarly, our equipment allows us to reveal and represent topographies of wireless networks. The measuring rod uses a typical mobile WiFi antenna to measure reception, and draw out 4 metre tall graphs of light."

http://www.triangulationblog.com/2011/02/light-painting-wifi.html