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x = 7, y = 7, rule = B3/S23 5bo$4bobo$3bo2bo$2bob2o$bobo$o2bo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C Still life
Pattern type Strict still life
Number of cells 14
Bounding box 7×7
Frequency class 9.2
Discovered by Unknown
Year of discovery Unknown

Half-bakery is a still life that is made up of two loaves (and makes up half of a bakery). When the term bi-loaf is used, this pattern is its most common meaning.

There is a remarkable reaction where a glider collides with the bi-loaf, displacing it by (3,6) and generating another glider in the same direction as the incident glider. The only other known reactions of this type involve stable reflectors, which have a displacement of (0,0), alongside a constellation of three blocks. This displacement reaction has enabled the construction of half-baked knightships, since there is a way to produce an extra glider using two of them:

x = 59, y = 53, rule = B3/S23 57bo$56bo$56b3o12$36bo$34b2o$35b2o22$20b2o$19bo2bo$19bobo$17b2obo$16bo 2bo$16bobo$17bo2$4b2o$3bo2bo$3bobo$b2obo$o2bo$obo$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 60 X -15 Y 15 TRACKLOOP 290 -3/290 -6/290 THUMBSIZE 2 ZOOM 10 HEIGHT 480 ]]
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RLE: here Plaintext: here

It can also act as a one-time glider reflector in various other collisions.


Half-bakery is the eleventh most common still life in Achim Flammenkamp's census, being less common than barge but more common than mango.[1] It is also the fifteenth most common object on Adam P. Goucher's Catagolue.[2]

See also


  1. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on June 6, 2013.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.

External links