Reminds me of another project visualizing wifi signals: > This project explores the invisible terrain of WiFi networks in urban spaces by light painting signal strength in long-exposure photographs. > A four-metre long measuring rod with 80 points of light reveals cross-sections through WiFi networks using a photographic technique called light-painting.

* More Info: nearfield.org/2011/02/wifi-light-painting * Video: https://vimeo.com/20412632 * Thread on Hacker News: https://news.ycombinator.com/item?id=2270878