The Swiss Federal Institute of Technology has developed an ultralight robotic aircraft that mimics the navigational abilities of a fly. The plane is completely autonomous, weighs 10 grams and has a 14 inch wingspan. It is designed to fly indoors, which is difficult because of the many potential obstacles. It can fly around a room completely unassisted for nearly five minutes.

The plane contains low-resolution "eyes", a tiny gyroscope and an onboard computer.

Link