I am in no way sure that I understand the point of this demo at all, but it’s very clever technology and the biggest companies in the world are starting to experiment with it.
Why not have a look at the GE page and try it for yourself. I did and it is amazing. Print the grid out here and then open the browser here. You’ll need to allow it to access your webcam. For me it worked perfectly in Firefox, but wouldn’t fire up in safari.