Gratuitous Digital Thingy. Most of the hard work is being done by the tracking computer on the second floor. A super wide angle infrared camera tracks low frequency light bouncing off people as they pass. The tracking computer sends information over the network to more computers in the reception and basement to control the vision and sound. We only had a week to create Gratuitous Digital Thingy, so most of the hardware came from parts lying around the TBWA offices and the Typeone Lab; CCTV equipment, conference room projectors and unloved computers. Source