From wired.co.uk

"Four students from the University of Tokyo have found a way to play Pong with a beam of light.

Sticky Light, a 3D tracking technology that lets you interact with a beam of light, batting it from one hand to another, is the work of Alvaro Cassinelli, Daito Manabe, Kuribara Yusaku and Stephane Perrin. It uses a low-power laser diode, two steering mirrors and a non-imaging photodetector. As Neotorama points out, the system is unusual as it doesn’t have a camera or projector.

Once configured, the half-milliwatt spot of light can travel across vertical and horizontal surfaces, following paths in a printed maze or bounding off contoured objects, including human hands.

The students say the light can be projected onto virtually anything, including skin. "The scanned material does not need to be just a black and white flat drawing; it can be virtually anything," they say. "What is needed is that the scanned object present enough contrast for the sticky light to be able to know its whereabouts, and then stick and/or follow the contours and shapes."

They say the technology could be used for games including a pinball and a "light-hockey" game in which players use their hands to bat the light, and scores will be displayed in real time.

The video below shows what the sticky light can do:"

How cool is that..... I want one

lol - I WANT A PET LIGHT!!!

I wanted to see the gear producing it

I want my pet light to change colour to reflect my mood ;-)

Oh my gosh, I see days of owners' cats and dogs chasing the light... That said, I want to play too :D