locator
notes
Devised by John Horton Conway; first published in Martin Gardner's Scientific American column, October 1970; B3/S23 rule, simultaneous update, zero-player; Turing complete; R-pentomino 1,103 generations; Gosper glider gun (November 1970, period 30); first interactive program on a PDP-7; Golly with Hashlife and Lua or Python scripting.