This reminds me of Roger Penrose's spacetime diagrams. http://copaseticflow.blogspot.co.uk/2014/07/nine-notes-about-penrose-and-escher.html http://copaseticflo

This reminds me of Roger Penrose's spacetime diagrams. http://copaseticflow.blogspot.co.uk/2014/07/nine-notes-about-penrose-and-escher.html http://copaseticflow.blogspot.co.uk/2014/07/nine-notes-about...