This week's featured article

A Garden of Eden is a pattern that has no parents and thus can only occur in generation 0. The term was first used in connection with cellular automata by John W. Tukey, many years before Conway's Game of Life was conceived. It was known from the start that Gardens of Eden exist in Life because of a theorem by Edward Moore that guarantees their existence in a wide class of cellular automata. The first Garden of Eden was found by Roger Banks and the MIT group in 1971. It had a bounding box of size 33 × 9 and 226 cells. Jean HardouinDuparc found the second and third Gardens of Eden by computer search in 1973, which had bounding boxes of size 122 × 6 and 117 × 6. His goal was to find Gardens of Eden with minimal height. In April 2016, Steven Eker found a Garden of Eden fitting inside a 5 x 83 bounding box. It is known that no Gardens of Eden exist with height less than 4, but the question is still open for the h=4 case.

In the news

 Apr. 67: LifeViewer standardizes support for triangular neighbourhoods starting with Build 320.
 Apr. 5: An exhaustive computer search run by Nathaniel Johnston reveals that there are 14,223,867,298 strict and 15,851,861,075 pseudo 33bit still lifes, including eleven pseudo still lifes that can be partitioned into three stable pieces but not two, and none that can be partitioned into four stable pieces but not two or three.[1]
 Mar. 27: The last remaining 14bit still life, xs14_4ai3zwo9a4, appears in a C1 soup on Catagolue, in a haul submitted by an anonymous user.[2]
 Mar. 24: apgsearch v5.03 gains the ability to log 'megasized' soups with final populations exceeding 3,000.[3] apgsearch 5.x can also preprocess asymmetric C1 B3/S23 soups on GPUs with CUDA support.[4]
 Mar. 7: A spider synthesis using 574 gliders and 9 LWSSes is found by Martin Grant. [5]
 Mar. 3: A period120 oscillator, the highest period thus far, occurs from a natural soup on Catagolue.
 Mar. 2: Several symmetricsoup diehards with lifespans over 1500 ticks have been found by 'carybe', using apgsearch..

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 Garden of Eden patterns with only 45 ON cells have been found?
 ... that it is known that no Garden of Eden patterns exist that are 1, 2, or 3 cells high, but that it is currently an open question whether a 4cellhigh GoE can be constructed?
 ... that 6cellhigh Garden of Eden patterns were constructed as far back as 1973, but 5cellhigh GoEs were unknown until Steven Eker found some in 2016?
 ... that in 2016, patterns were found that have greatgreatgrandparents but no greatgreatgreatgrandparents?
 ... that no way is known for a 3x3 pattern to be tiled into an MxN rectangle to produce a Garden of Eden, but that there are 4x3, 4x4 and larger tiles that can be repeated in this way to produce GoEs?
 ... 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 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 greatgrandfather pattern, except for Fx158?

