This is one of the most interesting videos I've seen in a long time. A couple guys thought it would be cool to show what wi-fi networks in everyday life look like -- using "lightpainting." Guess what, it's cool:

Here's the video:

Immaterials: Light painting WiFi from Timo on Vimeo.

Here's the explanation from Gawker:

This creative video traces the wifi strength of a city, in long exposure photographs, using a 4m rod with various points of light. It's a beautiful look into the invisible Wifi patterns that can be found in most urban spaces.