This week's featured article

Pentadecathlon is a period15 oscillator that was found in 1970 by John Conway while tracking the history of short rows of cells (see onecellthick pattern). Indeed, 10 cells placed in a row quickly evolve into this object, which is the most natural oscillator of period greater than 3. In fact, it is the fifth or sixth most common oscillator overall, being about as frequent as the clock, but much less frequent than the blinker, toad, beacon or pulsar. It is the only known oscillator that is a polyomino in more than one phase (besides the blinker).

In the news


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 block is the only known finite strict still life where each living cell has exactly 3 neighbours?
 ... that all strict still lifes up to and including 14 cells have been found by apgsearch in asymmetrical 16×16 soups?
 ... that c/2 orthogonal and c/4 diagonal were the only speeds of spaceships seen to emerge from asymmetric soups on Catagolue until 2020?
 ... that all currently known standard Herschel conduits produce the same Herschel greatgrandfather pattern, except for Fx158?
 ... that eater 1 is the smallest asymmetric still life?
 ... that in Life, no spaceship can exist with a speed of (m,n)c/x where (m+n)/x > 0.5?
 ... that even without using fixedcost reverse caber tosser technology, an Nbit strict still life – specifically, some length of long long (...) boat or barge – can be constructed for any odd integer N using no more than 34 gliders, and for any even integer N using no more than 33 gliders, using a temporary tubstretcher?
 ... that even without using fixedcost reverse caber tosser technology, an Nbit period2 oscillator can be constructed for any odd integer N using no more than 45 gliders, and for any even integer N using no more than 46 gliders, using a temporary tubstretcher?
 ... that it is currently an open question as to if there exists a periodic pattern whose only predecessors are its own evolutionary sequence?
 ... that it was proved in the early 1970s that reflectorless rotating oscillators exist in Life, but none were found until 2018 when Adam P. Goucher completed the 0E0P metacell?

