You paint abstract geometric patterns and sounds directly onto the screen. It is a playful and performative device, as anything that you do will cause an instantaneous reflection in the gadget’s sonic and visual output.
Just watch the video below, the grey square is the position of the light pen.
Niklas actually gave me an early version of the Lumenoise. The battery and the circuit were not yet inside the pen, but that doesn’t change the fact that it’s funny to play with. The simplicity of the this technology is really amazing.