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New page: {{Stilllife|name=Block and two tails|pname=blockandtwotails|c=12|life105=true|life106=true|plaintext=true|rle=true}} '''Block and two tails''' is the fifty-sixth most common still life...
 
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{{Stilllife|name=Block and two tails|pname=blockandtwotails|c=12|life105=true|life106=true|plaintext=true|rle=true}}
{{Stilllife
'''Block and two tails''' is the fifty-sixth most common [[still life]], being less common than [[trans-hook and R-bee]] but more common than [[cis-boat and dock]].<ref>{{cite web|url=http://wwwhomes.uni-bielefeld.de/achim/freq_top_life.html |title=Most seen natural occurring ash objects in Game of Life |author=Achim Flammenkamp |date=September 7, 2004 |accessdate=January 15, 2009}}</ref>
|name             = Block on cover
|pname           = blockoncover
|c               = 12
|bx              = 5
|by              = 5
|fc              = 19.9
|symmetry        = /
|discoverer      = Robert Wainwright
|discoverer2      = Everett Boyer
|discoveryear    = 1973
|rulemin          = B/S23
|rulemax          = B3678/S012345678
|rulespecial      = [[Conway's Game of Life|Conway Life]], [[HighLife]]
|isorulemin      = B/S2aek3ar
|isorulemax      = B2ikn34-ai5-kr678/S012345678
|synthesis        = 4
|synthesisRLE    = true
|plaintext       = true
|rle             = true
|apgcode          = xs12_178br
|niemiecid        = 12.111
|pentadecathlonid = 12.3
|viewerconfig    = [[ ZOOM 48 ]]
}}
'''Block on cover''' is a {{slcells|12|text=12-cell}} [[still life]] consisting of a [[block]] stabilizing a [[cover]].


==See also==
== Commonness ==
*[[Block]]
{{main|List of common still lifes}}
*[[List of common still lifes]]
Block and two tails is the fifty-sixth most common [[still life]] in [[Achim Flammenkamp's census]], being less common than [[trans-bookend and bun]] but more common than [[cis-boat on dock]].<ref>{{citeAchim|accessdate=January 15, 2009}}</ref>


==References==
It is the 58th [[List of common still lifes|most common still life]] on [[Adam P. Goucher]]'s [[Catagolue]], being less common than [[eater head siamese eater tail]] but more common than [[cis-boat on dock]]. It is the 6th most common still life with 12 cells, being less common than [[eater head siamese eater tail]] but more common than [[cis-block on long bookend]].<ref>{{citeCatagolueStats|May 5, 2023}}</ref>
<references />
 
The [[octo3obj database]] contains 22 collisions with block on cover occurring in the ash.
 
== Construction ==
On April 4, {{year|2007}} [[Dean Hickerson]] found a {{gliders|4}} [[Glider synthesis|synthesis]] of this still life.<ref name="drh_syntheses" />
 
A number of known alternate syntheses can be found in [[Mark Niemiec's database]].<ref name="niemiec" />
 
{{EmbedViewer
|rle          = x = 52, y = 29, rule = B3/S23
9bobo23bo$10b2o23bobo$10bo24b2o2$bo8b3o$b2o9bo21bo$obo8bo22b2o$33bobo
2$40b3o$40bo$41bo4$20bo28b2o$19b2o27b2o$bo17bobo4bo4bo18bo$2b2o22bobo
3b2o$b2o23b2o3b2o2$22bo$9bobo10bobo26bo$10b2o10b2o25b2o$10bo39b2o2$37b
o9bo$38bo6b2o$36b3o7b2o!
|viewerconfig = #C [[ THEME Book ZOOM 6 AUTOSTART GPS 12 T 0 PAUSE 3 T 33 PAUSE 2 LOOP 34 ]]
|position    = center
|caption      = Several 4G syntheses<ref name="niemiec" /><ref name="cc4g" />
|style        = width:300px;
}}
 
== See also ==
* [[Beacon on cover]]
 
== References ==
<references>
 
<ref name="drh_syntheses">[https://conwaylife.com/ref/DRH/syntheses.html 2, 3, and 4-glider syntheses] on Dean Hickerson's Life page</ref>
<ref name="niemiec">{{LinkNiemiec|p1-12.htm|The 121 twelve-bit still-lifes|rle=12/12-111.rle|nobullet=nobullet}}</ref>
<ref name="cc4g">[https://github.com/carson-cheng/4g-database {{filename|carson-cheng/4g-database}}] on GitHub</ref>
 
</references>
 
== External links ==
* {{LinkCatagolue|xs12_178br}}
* {{LinkPentadecathlonObject|12.3}}
 
__NOTOC__

Latest revision as of 04:53, 16 January 2025

Block on cover
x = 5, y = 5, rule = B3/S23 2ob2o$2obo$3bo$3o$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 48 ]]
View static image
Pattern type Strict still life
Number of cells 12
Bounding box 5 × 5
Frequency class 19.9
Static symmetry / (D2_x)
Discovered by Robert Wainwright
Everett Boyer
Year of discovery 1973

Block on cover is a 12-cell still life consisting of a block stabilizing a cover.

Commonness

Main article: List of common still lifes

Block and two tails is the fifty-sixth most common still life in Achim Flammenkamp's census, being less common than trans-bookend and bun but more common than cis-boat on dock.[1]

It is the 58th most common still life on Adam P. Goucher's Catagolue, being less common than eater head siamese eater tail but more common than cis-boat on dock. It is the 6th most common still life with 12 cells, being less common than eater head siamese eater tail but more common than cis-block on long bookend.[2]

The octo3obj database contains 22 collisions with block on cover occurring in the ash.

Construction

On April 4, 2007 Dean Hickerson found a 4-glider synthesis of this still life.[3]

A number of known alternate syntheses can be found in Mark Niemiec's database.[4]

x = 52, y = 29, rule = B3/S23 9bobo23bo$10b2o23bobo$10bo24b2o2$bo8b3o$b2o9bo21bo$obo8bo22b2o$33bobo 2$40b3o$40bo$41bo4$20bo28b2o$19b2o27b2o$bo17bobo4bo4bo18bo$2b2o22bobo 3b2o$b2o23b2o3b2o2$22bo$9bobo10bobo26bo$10b2o10b2o25b2o$10bo39b2o2$37b o9bo$38bo6b2o$36b3o7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME Book ZOOM 6 AUTOSTART GPS 12 T 0 PAUSE 3 T 33 PAUSE 2 LOOP 34 ]]
Several 4G syntheses[4][5]
(click above to open LifeViewer)

See also

References

  1. ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  2. ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on May 5, 2023.
  3. ↑ 2, 3, and 4-glider syntheses on Dean Hickerson's Life page
  4. ↑ 4.0 4.1 The 121 twelve-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 12/12-111.rle)
  5. ↑ carson-cheng/4g-database on GitHub


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