Langton's Simple Automaton
nMuch simpler than von Neumann’s
nModified a small component part of a previous automaton so that it would reproduce itself
nA 10 x 10 loop with a 5 x 3 arm
nThe “instruction tape” fits inside and extends arm by 6 units, turns left, repeats this 3 times, till arm collides with self, breaks off new loop and makes new arms for each.
nReproduces in 151 time-steps