Serial Cut//Pop-up

There's something fascinating about pop up books. I don't know what it is, but I've always found them exciting. When I think about it, perhaps it's the 2D representaion of a 3D situation (a photograph) which is then arranged to provide an imitation of 3D depth. Or the faceted image which may be a 3D object, but only readable from a 2D perspective. And then what if the pop up image is then re-photographed?

I found these works, which are actually advertisments by Serial Cut for the Renfe train service in Spain...