The Firefly Flyfire Project

Flyfire, a project initiated by the SENSEable City Laboratory in collaboration with ARES Lab (Aerospace Robotics and Embedded Systems Laboratory) aims to transform any ordinary space into a highly immersive and interactive display environment. To do so, they put a few hundred LED-equiped toy-like helicopters in the air, and use them to create some fantastic visual effects. Check it out:

[Firefly Project]