
via
Percussa where you'll find the full post including pics.
"If you think the AudioCubes are just a collection of glowing lamps you can put on your night desk,…then you definitely need to read the paragraph below :-)
You are right that the AudioCubes have LEDs inside, but there is far more technology inside every AudioCube than you might think.
An AudioCube has four onboard infrared sensors (one on each face) to communicate and measure distances to objects nearby, digital signal processors (DSP), a USB-rechargeable battery, and a translucent housing.
PCB AudioCubes - ready to be built into the housingAs you can see on the picture we didn’t use an Arduino nor standard off-the-shelf sensors. We’ve developed our own custom wireless sensor and communication systems for AudioCubes from the ground up, using infrared technology..."