I love the version of this for light painting Wifi signal strength: http://voyoslo.com/projects/immaterials-wifi-light-painting/ http://voyoslo.com/projects/imm

I love the version of this for light painting Wifi signal strength: http://voyoslo.com/projects/immaterials-wifi-light-painting/ http://voyoslo.com/projects/immaterials-wifi-light-painting/