Move over, Jackson Pollock. Artist Timo Arnall eschews the oil paints for light by creating visualizations of WiFi signals. Says Arnall on Vimeo:

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.

Video of the art in action below, along with a few more incredible works of light-painting.

Light Painting Action Flick

Exhaust Lights

Paris by Light