T(ether) is an experimental interface from the MIT Media Lab, which its creators call 'a tool for spatial expression'. It basically allows users to create objects that exist in a virtual space, which can be interacted with by multiple users.
There's two things I like about this project, firstly the idea of creating and manipulating 3D objects using your hands, like a sculptor. It reminds me of the short film 'World Builder'. Secondly, I like the thought of a shared virtual space, I can imagine all these virtual things existing in a real space but you can only see them through a pair of glasses or in this case a virtual window.