Editing Conway's Game of Life (section)

===Self-replication===

A pattern can contain a collection of guns that fire gliders in such a way as to construct new objects, including copies of the original pattern. A ''universal constructor'' can be built which contains a Turing complete computer, and which can build many types of complex objects, including more copies of itself.<ref name="bcg"/> On November 23, 2013, Dave Greene built the first [[replicator (cellular automaton)|replicator]] in the Game of Life that creates a complete copy of itself, including the instruction tape.<ref>{{cite web|url=https://conwaylife.com/forums/viewtopic.php?f=2&t=1006&p=9917#p9901|title=Geminoid Challenge|publisher=Conwaylife.com|access-date=2015-06-25}}</ref> In October 2018, Adam P. Goucher finished his construction of the 0E0P metacell, a metacell capable of self-replication. This differed from previous metacells, such as the OTCA metapixel by Brice Due, which only worked with already constructed copies near them. The 0E0P metacell works by using construction arms to create copies that simulate the programmed rule.<ref>{{cite web|last=Passe-Science|title=Automate Cellulaire - Passe-science #27|via=[[YouTube]]|date=2019-05-29|url=https://www.youtube.com/watch?v=CfRSVPhzN5M|archive-url=https://ghostarchive.org/varchive/youtube/20211211/CfRSVPhzN5M|archive-date=2021-12-11|url-status=live|access-date=2019-06-25}}{{cbignore}}</ref> The actual simulation of the Game of Life or other [[Moore neighbourhood]] rules is done by simulating an equivalent rule using the [[von Neumann neighbourhood]] with more states.<ref>{{Cite web|url=https://cp4space.wordpress.com/2018/11/12/fully-self-directed-replication/|title=Fully self-directed replication|last=apgoucher|date=2018-11-12|website=Complex Projective 4-Space|language=en|access-date=2019-06-25}}</ref> The name 0E0P is short for "Zero Encoded by Zero Population", which indicates that instead of a metacell being in an "off" state simulating empty space, the 0E0P metacell removes itself when the cell enters that state, leaving a blank space.<ref>{{Cite web|url=https://conwaylife.com/wiki/0E0P|title=0E0P metacell - LifeWiki|website=conwaylife.com|access-date=2019-06-24}}</ref>