I can't quite tell if they're doing this in the video, but you can project things out of a 3d display. You just have to avoid the object touching the sides of

I can't quite tell if they're doing this in the video, but you can project things out of a 3d display. You just have to avoid the object touching the sides of the screen. With that, you could have participants feel like their hands are in the same place without hitting glass.