project iris is an interactive light installation jointly produced by the university of saarbrücken, germany and
university of munich, germany for the ars electronica festival in linz, austria. the design allows people walking
by the ars electronica building to literally paint with light on the façade  using their  mobile phones. after loading
the application, users can select colours and draw over the image of the building shown on their phone’s camera.
this instantly triggers the lights on the faced to change colour accordingly. the system can also be used to play
games, including a jigsaw puzzle.

http://project-iris.org

iRiS - http://project-iris.org/ from awiethoff on Vimeo.

via gizmodo