Figure eight

Figure eight (or less frequently, big beacon[1] or lemniscate) is a period-8 oscillator found by Simon Norton in 1970.[2] With 12 cells in its initial phase, it is the smallest known period 8 oscillator, behind blocker at 15 cells. It is known that no period 8 oscillators exist with 10 or fewer cells.[3]

Figure eight
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>2o$2obo$4bo$bo$2bob2o$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ GPS 4 THUMBSIZE 2 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
View animated image
View static image
Pattern type Oscillator
Number of cells 12
Bounding box 10×10
Frequency class 23.4
Period 8
Mod 8
Heat 16.5
Volatility 1.00
Strict volatility 1.00
Discovered by Simon Norton
Year of discovery 1970

Producing a domino spark, it is useful for constructing larger oscillators with period that is a multiple of eight. For example, it appears in tumbling T-tetson (period 8), sailboat (period 16), caterer on figure eight (the smallest period 24 oscillator), and figure eight on 36P22 (period 88). It is also the key component in the p8 bouncer.

Commonness

Figure eight is the tenth most common naturally-occurring oscillator in Achim Flammenkamp's census, being less common than the great on-off but more common than the spark coil.[4] On Catagolue, it is the most common period 8 oscillator, being more common than blocker.[5]

  • One of the phases of the oscillator, which led to both of its names.
gollark: No.
gollark: Human bodies (and most evolved things) have a weird thing going on where they simultaneously contain vast quantities of miraculously well-optimized stuff and ridiculous nonsensical quirks an actual engineer would have easily fixed.
gollark: Obviously, it's bad design and I would totally do better.
gollark: It's called Muller's ratchet.
gollark: The whole sex chromosome thing is vaguely weird because apparently, since there's no recombination, they are subject to inevitable slow genetic decay.

See also

References
  1. "Big beacon". The Life Lexicon. Stephen Silver. Retrieved on June 14, 2011.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. Mark Niemiec (1998). "Life Period-8 Oscillators". Retrieved on February 5, 2009.
  4. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  5. Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
  • 12P8.1 at Heinrich Koenig's Game of Life Object Catalogs
This article is issued from Conwaylife. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.