The MIT Media Lab's Tangible Media Group recently unveiled inFORM, its dynamic shape display, which, besides being the coolest tech invention we've seen in months, also allows you to interact with real objects by reaching through your screen.
Here's how they describe it:
Dynamic Shape Display that can render 3D content physically, so users can interact with digital information in a tangible way. inFORM can also interact with the physical world around it, for example moving objects on the table's surface. Remote participants in a video conference can be displayed physically, allowing for a strong sense of presence and the ability to interact physically at a distance.