The WIRED article seems to imply that this device has outwardly-facing cameras that use Kinect-like technology to track the operator's hands, which is probably how they are able to let you interact with the projections without using some kind of wand or controller.

I could see some "high-precision" gloves being an optional accessory for this that would include some kind of tracker markings to allow even more precise controls (maybe for medical applications or something)