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Triplepseudostilllife small.png
A still life is a pattern that does not change from one generation to the next, and thus may be thought of as an oscillator with period 1. Still lifes are sometimes assumed to be finite and non-empty. The two main subgroups of still lifes are strict still lifes and pseudo still lifes. In some contexts, the term "still life" may refer to strict still lifes.

A strict still life is a still life that is either connected (i.e., has no islands), or is such that removing one or more its islands destroys the stability of the pattern. For example, beehive with tail is a strict still life because it is connected, and table on table is a strict still life because neither of the tables are stable by themselves.

A pseudo still life consists of two or more islands which can be partitioned (either individually or as sets) into non-interacting subpatterns which are by themselves each still lifes. Furthermore, there must be at least one dead cell that has more than three alive neighbours in the overall pattern but has less than three alive neighbours in the subpatterns. This final restriction removes patterns such as bakery, blockade and fleet from consideration, as the islands are not "almost touching".

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Did you know...

  • ... that there are spaceship stabilizations of agars?
  • ...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 13 cells, and all but one of the 619 strict still lifes with 14 cells, have been found by apgsearch in asymmetrical 16x16 soups?
  • ...that c/2 orthogonal and c/4 diagonal are the only speeds of spaceships seen to emerge from asymmetric soups on Catagolue?
  • ...that all currently known standard Herschel conduits produce the same Herschel great-grandfather 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 fixed-cost reverse caber tosser technology, an N-bit strict still life – specifically, some length of long long (...) boat or barge – can be constructed for any odd integer N using no more than 39 gliders, and for any even integer N using no more than 38 gliders, using a temporary tubstretcher?
  • ... that even without using fixed-cost reverse caber tosser technology, an N-bit period-2 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?          
Showing 10 items out of 92 More did you know...