This week's featured article
Demonoid is the first type of self-constructing diagonal spaceship in the B3/S23 rule. A small "0hd Demonoid" was completed by Chris Cain in December 2015, shortly after a much larger 10hd version constructed in November in collaboration with Dave Greene.
The 0hd spaceship displaces itself by 65 cells diagonally every 438,852 generations. As of 2018 it is the only case where a spaceship gun pattern was completed before the actual spaceship -- the first 0hd Demonoid was fired by a gun. Unlike its Gemini predecessor, removal of old construction arms is not done by a separate destruction arm, but rather by "self-destruct circuitry" -- a scattering of still lifes that allow a single glider to cleanly destroy the entire mechanism, as shown at right.
In the news
|The LifeWiki contains one of the most comprehensive catalogues of patterns available on the internet. Within it you will find:
Did you know...
- ... 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 34 gliders, and for any even integer N using no more than 33 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?
- ... 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?
- ... that there are currently known elementary spaceships with speeds c/7 and c/10 orthogonal, but none with c/8 or c/9?
- ... that there are currently known elementary spaceships with speeds c/7 and c/12 diagonal, but none with c/8, c/9, c/10 or c/11?
- ... that while the speed limit for orthogonal spaceships in rules using the Moore neighbourhood is c orthogonal, spaceships in Larger than Life rules are capable of breaking this barrier?
- ... that without the use of adjustable glider loops, there are no known oscillators with periods 43 or 53?