Remember the Sony HMZ-T2 3D head-mounted display that we tried on back at IFA? Well, it's being prominently featured here at TGS, too. Tucked away at a smaller, much more modest booth around the corner, however, is something a smidge more interesting. Kept behind glass and a safe distance away from our grubby mitts and sweaty foreheads resides the "Prototype-SR" (Substitutional Reality) that was outed on YouTube last week. Essentially, the unit appears to be the HMZ-T2 with a front-mounted camera for head tracking and camera functionality -- the sort of thing that will provide what's being called a 360-degree immersive entertainment experience. From what we can tell from the booth monitors, the unit displays 3D video overlaid in real space for the person wearing the device. Details are scarce and extremely limited demos were available in an apparent lottery (no luck here). You can rest assured that if we're able to snag one, though, we'll be sure to offer up some impressions. For now, take a look at the camera-wielding set of hi-tech goggles in the gallery below and the aforementioned video awaits just past the break.