Physical interaction design DH2400

ZeroN (another project from MIT with Iroshi Ishii) makes possible something really amazing: Levitated Interaction. 

Is the beginning of this type of interaction but they have really good examples of possible applications like modeling in real time the shadows produces by a source of light, direct interaction with the levitated element and even playing a kind of ping pong. 

I liked this project for the future applications and how it can be integrated with future holographic technologies.