A demo build is avaliable on https://gallery.leapmotion.com/button-builder/
At a high level, this demo shows off:
Graphical optimizations- Through the use of the Graphic Renderer, the scene can be rendered in just a few draw calls!
Intuitive interaction- The Interaction Engine allows all of the interface elements to respond physically and intuitively.
Curved spaces- Due to the tight integration of curved spaces into both the Graphic Renderer and the Interaction Engine, the entire interface can be trivially warped into a curved space, and everything still works as you intend!