• Type A— Glider Guns and Spaceship Guns Oscillating objects which emit moving objects at a constant rate.
  • Type B— Puffer Spaceships Moving objects leave behind objects at a constant rate.
  • Type C— Growing Spaceships Moving objects in which the front and back move at different rates, resulting in an object which expands in the middle at a constant rate.
  • Type D— Expanding Objects Objects in which moving parts leave behind a connected trail ending in a stable or oscillating end (wickstretchers) or in which the boundaries move enclosing a continuosly growring stable or oscillating pattern (spacefiller).
  • Type E— Others Infinite objects which do not fit the above categories