After you click the camera to take, say, a selfie, the rigid cartridge will pop out of a slot in front and if you hold up the screen, the GIF slowly develops -- just like a Polaroid would -- and comes into focus.
It's pretty fascinating, even if building one yourself looks very, very complicated. Still, if you feel inclined to give yourself a project and build one of these, you can. Singh's posted full instructions for how to build this sucker on Imgur. As he put it in a YouTube video touting the invention: "I built this entirely from scratch, released all the code, and all the design files." Now you can do the same.
Check out more of Singh's work at his GIF-laden website Shek.it.