We love those wacky quadrotors, what with their ability to flit around and build structures. Now check out quadrotors engaging in some aerial circus.

Researchers at the Swiss Federal Institute of Technology programmed racket-equipped quadrotors to volley ping-pong balls at each other in the school's Flying Machine Arena. Between this and that robotic archer, we're witnessing the Robolympics in its nascency. Imagine the controversy that will unfold when robot Andre Agassi shaves his silicon mullet!

[Via Technabob]