Tvor is endowed with artificial intelligence that steers it towards the darkest place in the room. It seeks out darkness relentlessly, but its illuminating presence transfers the darkness to another place. Tvor is thus doomed to endless travel.
The main buliding block of Tvor is Arduino, an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. Arduino can sense the environment by receiving input from a variety of sensors and can affect its surroundings by controlling lights, motors, and other devices.
This video shows testing of a prototype completed in September 2010.