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x = 4, y = 4, rule = B3/S23 b2ob$o2bo$bobo$2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life
Pattern type Strict still life
Number of cells 7
Bounding box 4×4
Frequency class 2.7
Discovered by JHC group
Year of discovery 1970

Loaf is a 7-cell still life discovered by the JHC group in 1970.[1] It can be seen as a weld of two beehives.


Loaf is the third most common still life in Achim Flammenkamp's census, being about a third as common as beehive but only slightly more common than boat.[2] It is also the fifth most common object on Adam P. Goucher's Catagolue. It is the most common 7-bit still life, being more common than the long boat.[3] The V-pentomino turns into the W-pentomino after one generation, which then turns into a loaf after two more.


A loaf has a partial eater property: certain collisions can destroy the upper rightmost two cells (in the orientation shown in the picture), after which the remainder of the pattern will evolve into a new loaf, flipped 180°. Eater 3 is an actual eater making use of this reaction.

A similar reaction to this involves a block "eating" a loaf, similarly to how the beehives in the queen bee shuttle are removed; stabilising this can be used to construct the Baker's dozen.

Loaf is the stator in both mold and jam, and it can be augmented with tails to give the cis- and trans-loaf with tail.

Loaf can be attached to itself to give four still lifes, namely half-bakery, bi-loaf 2, loaf back tie loaf and loaf siamese loaf.


x = 23, y = 8, rule = B3/S23 21b2o$21bo$19bobo$19b2o$b2o7b2o$o2bo5bo2bo$b3o6bobo$11bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 8 THUMBSIZE 2 ]]
A honey farm hitting a loaf a certain way restores the loaf. (click above to open LifeViewer)
x = 14, y = 13, rule = B3/S23 5b2o$5b2o4$2o4b2o4b2o$2o3bo2bob2o$5bobo2bo$6bo2$3bo$2bobo$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 8 THUMBSIZE 2 ]]
Another loaf-spin reaction, used in the p130 shuttle. (click above to open LifeViewer)
x = 18, y = 6, rule = B3/S23 b2o$o2bo$o14b3o$bo2bo10bo$2b2o13bo$16b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 4 THUMBSIZE 2 ]]
Two semi-common sequences that evolve into two loaves. (click above to open LifeViewer)

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
  2. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.

External links