Block and glider

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Block and glider
x = 4, y = 3, rule = B3/S23 2o$obo$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Pattern type Methuselah
Number of cells 6
Bounding box 4×3
Lifespan 106 generations
Final population 9
L/I 17.7
F/I 1.5
F/L 0.085
L/MCPS 17.7
Discovered by Unknown
Year of discovery Unknown

Block and glider is a common evolutionary sequence. The form shown in the infobox to the right is a hexaplet which may be considered a methuselah that stabilizes at generation 106 as a block and a glider. A WSW-3 conduit can be made by eating the extra block using another block or eater 1.

The second generation of the form shown in the infobox is a wing, which is a common induction coil. As a result of this, the block and glider sequence is named "W" in conduit terminology. The nine, another important still life component, is a parent of the form shown in the infobox.

Block and glider is technically a failed puffer, as it reappears thirty-two generations later having been shifted 3 cells right and 7 cells up, but is turned into a B-heptomino another three generations later.

Like other common evolutionary sequences, block and glider can be hassled, such as in the p25 wing and block hassler[note 1] and p128 wing shuttle;[4] the latter is tied for the smallest p128 oscillator by population.


Generation 104 of block and glider
bo$obo$obo$bo$4b2o$4bo$4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 8 THUMBSIZE 2 ]]
A pattern that enters the block and glider sequence fairly late
(click above to open LifeViewer)


  1. An alternative version of this oscillator is shown in jslife with a different method of stabilization.[1] Nicolay Beluchenko found the simpler stabilization with two fumaroles later on.[2] However, it is unknown when or by whom this reaction was found.[3]


  1. Jason Summers' jslife pattern collection. Retrieved on November 9, 2021.
  2. Matthias Merzenich (April 18, 2018). "osc-supplement pattern collection". Retrieved on November 9, 2021.
  3. David Raucci (December 11, 2020). Updated oscillator stamp collection (was: Re: Golly suggestions) (discussion thread) at the forums
  4. David Raucci (August 24, 2021). Re: Oscillator Discussion Thread (discussion thread) at the forums

External links