“Parasite”, by Katharina Weier is a portable information device or electronic sticker built with an Arduino and Xbee Shield that is attached to a host in a dense urban environment. When the device comes into contact with another device it spreads a message across an LED matrix which is then saved and perpetuated to the next device. Check out some pics of the circuit build and videos of the messages sent at the link below.

Reconqr, via Network Research