title: 4d and n-dimensional physics engine
body: <p>Was somebody trying to implement 4d or n-dimension physics realtime (or not) engine?</p>
  
  <p>What difficulties in this implementation, compare to 3d and 2d physics engines? Of course, one of which is presentation problem. Is's an interesting to look at and to find out more about 4d hyperspheres, hypercubes, springs, joints, liquids and other objects.</p>
  
  <p>I am just curious, and not have a real application using it.</p>
  
  <p>Generalization of my idea is physics in lobachevskian or riemann geometries, distortion spaces (you can go through the needle's eye), looped spaces (returning to the same place), physics paradoxes and other amazing things.</p>