This week's featured article

HighLife is a Lifelike cellular automaton in which cells survive from one generation to the next if they have 2 or 3 neighbours, and are born if they have 3 or 6 neighbours; that is, it has rulestring "B36/S23". It was named by John Conway and was first considered in 1994 by Nathan Thompson. It is mainly of interest due to a simple replicator that it allows.
Because its rulestring is so similar to that of Conway's Game of Life, many simple patterns exhibit the same behavior in both rules; it's only when patterns get complex that their behavior differs. Nonetheless, it exhibits such rich structure that Conway himself stated
"It seems to me that 'B36/S23' is really the game I should have found, since it's so rich in nice things."
All of the most common still lifes, oscillators and spaceships from the standard Life rules behave the exact same under the HighLife rules, including the block, beehive, blinker, glider, lightweight spaceship, middleweight spaceship, and heavyweight spaceship. On the other hand, even though traffic lights and honey farms themselves behave the same in both rules, they do not occur naturally in HighLife with any sort of regularity due to their common predecessors being unstable.

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 despite being the fourth smallest nonflotilla orthogonal spaceship, loafer has never appeared from a single randomly generated soup?
 ... that all known glider eaters take at least four ticks to recover to their original state after eating a glider?
 ... that the smallest 31c/240 spaceship does not make use of the 31c/240 reaction?
 ... that there is roughly one chance in 10^(N/3) that a still life appearing out of random soup will have a population of exactly N cells?
 ... that the number of still lifes with N+1 bits is roughly 2.48 times larger than the number of Nbit still lifes?
 ... that the odds of a randomlychosen 20x20 soup pattern being a methuselah that lasts between 1000N and 1000(N+1) ticks, is roughly the same as the odds that it will last any amount of time longer than 1000x(N+1) ticks?
 ... that all still lifes up to 15 cells can be synthesized at a cost of less than one glider per cell?
 ... that absolutely no elementary knightships have been discovered as of 2016, though there has been at least one very close call?
 ... that there is a 6x2 counterexample to the Coolout Conjecture, proving that patterns that are internally compatible with stability can not always be made part of a larger still life, no matter what cells are added around the edges?
 ... that a Conway's Life pattern representing a complete programmable 8bit computer, consisting only of buckaroos, p60 glider guns, and glider duplicators, was completed in November 2016?

