This week's featured article

2×2 is a Lifelike cellular automaton in which cells survive from one generation to the next if they have 1, 2 or 5 neighbours, and are born if they have 3 or 6 neighbours. That is, it is governed by the rulestring "B36/S125". Patterns under the rule have a chaotic evolution similar to those under the standard Life rules, but the chaos tends to die out much more quickly.
The 2×2 rule gets its name from the fact that it can emulate a simpler cellular automaton that acts on each 2×2 block. The emulated automaton is a block cellular automaton that makes use of the Margolus neighbourhood. As a result, patterns that are originally made up of 2×2 blocks will forever be made up of 2×2 blocks, but the block partition will be offset by one cell in the odd generations from the even generations. There are 2^{12} = 4096 such Lifelike automata, of which 2×2 is the most wellknown.

Pattern collection

The LifeWiki contains one of the most comprehensive catalogues of patterns available on the internet. Within it you will find:


Did you know...

 ... that in 2014 a new natural infinite growth pattern was discovered, starting from a symmetric random starting configuration?
 ... that the first selfconstructing Conway's Life pattern was built in 2010?
 ... that the first glider synthesis for a c/3 spaceship was completed in 2014?
 ... that the first "macrospaceship" gun (a Gemini spaceship gun) was constructed in 2010, followed by the HBK gun in January 2015?
 ... that the waterbear is the single known highspeed oblique spaceship, many orders of magnitude faster than Gemini spaceships and halfbaked knightships?
 ... that there are no known direct reflectors for lightspeed wire signals, or for signals in 2c/3 wires?
 ... that 24 tencell patterns exhibit infinite growth, with 17 unique pattern types, but that it has been proven that no ninecell pattern exhibits infinite growth?
 ... that all still lifes up to 18 bits have a known glider synthesis, but it's still not known whether all still lifes are synthesizable.
 ...that the French kiss remained without a glider synthesis until 2013?
 ... that Adam P. Goucher's distributed Catagolue soupsearch project, started in February 2015, has already tested more random soups than any previous such project, and has contributed to the reduction of many glider construction recipes?

