Ok, so not technically WiFi, but the series of images in this video were shot using a specially designed pole with 80 bulbs that turned off and on depending on the signal strength of the WiFi in the area. It's a really interesting concept which is the result of a collaboration between Touch, a research project that investigates Near Field Communications and a London design company called Berg.
If you're interested in the specifics of how they did this (which includes a lot of technical information that I'm not really all that sure of), check out the teams making of blog post HERE.
Also, check out their Flickr page which has more of these really cool images HERE.
From Nick:
Hey guys, I’m brand new to the FStoppers team and I’d love to hear from you, stop by my Facebook page or check out my website, www.CharlestonsWeddingPhotograper.com
Wow, very creative....loved it
That's a cool idea, but such a dull BTSV!