The old 2D paper describing 3D curvature is a little lame because it uses gravity to describe gravity. You know, the little ball circling the 2D psuedo-black hole, well remove gravity and the ball would fly off the 2D paper, you cant use gravity to describe gravity. It would be like saying 1=1 because 1=1. Proving your answer with the question. How else can you visualize shortened distances, even in 2D. Has anyone else been bothered by that before?