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Wi-Fi signals at night

Wall of light

AHO network

Floating fence

Hidden topography

Bus stop

RN-131C WiFly module

Timo Arnall, Jorn Knutsen, and Einar Sneve Martinussen, Ph.D. candidates from the Oslo School of Architecture and Design, have found a unique way to visualize invisible Wi-Fi signals in their Norwegian city by light painting signal strength in long-exposure photographs.
Caption by / Photo by Timo Arnall
To create the mesmerizing visuals, the artists placed a camera nearby as they took a Wi-Fi-equipped rod with 80 LEDs to various locations at nighttime in the Oslo borough of Grunerlokka. The lights illuminate at varying levels depending on signal reach.
Caption by / Photo by Timo Arnall
A dense network in the forecourt of the Oslo School of Architecture and Design.
Caption by / Photo by Timo Arnall
This light painting almost looks like a transparent floating electric fence around the brick building.
Caption by / Photo by Timo Arnall
This shot, a combination of five separate photos, reveals the hidden topography of wireless networks in Oslo.

"The strength, consistency, and reach of the network says something about the built environment where it is set up, as well as reflecting the size and status of the host," according to Martinussen.

Caption by / Photo by Timo Arnall
An Oslo bus stop within a Wi-Fi network.
Caption by / Photo by Timo Arnall
The central component of the Wi-Fi light- painting project is Roving Network's RN-131G WiFly module, designed as an Arduino shield by Sparkfun.
Caption by / Photo by Timo Arnall
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