Smiley

Smiley is a period-8 oscillator that was found by Achim Flammenkamp on July 17, 1994[1] and named by Alan Hensel.

Smiley
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Pattern type Oscillator
Number of cells 17
Bounding box 7×8
Frequency class 42.4
Period 8
Mod 4
Heat 22.5
Volatility 1.00
Strict volatility 1.00
Discovered by Achim Flammenkamp
Year of discovery 1994

In November 1994 Mark Niemiec noticed that its sparks can interact in boring, but non-trivial ways with other oscillators, optionally creating oscillators of higher periods.[2]

Synthesis

A 28-glider synthesis for it was discovered in October 2007 by Jason Summers.[3] In November 2014, Martin Grant posted an 11-glider synthesis based on a symmetric soup found by Ivan Fomichev using apgsearch.[4] In August 2015, Matthias Merzenich posted an 8-glider synthesis based on the first asymmetric soup, found by Adam P. Goucher.[5][6]

Commonness

On Catagolue, it is the fourth most common period 8 oscillator, being less common than Coe's p8 but slightly more common than Achim's p8.[7]

Generation 2 reveals the reason for smiley's name
gollark: Yes. Sufficiently densely packed nanobots consuming the Earth could do it, even.
gollark: ::1/128, for example, which is localhost, matches only ::1 and no other IP. 200::/7 matches anything where the first 7 bits match those of 0x200.
gollark: Did you check the wikipedia page on it?
gollark: It is called "CIDR".
gollark: bee5:aeae::/32 means "IPs where the first 32 bits match bee5:aeae".

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Mark Niemiec (November 1, 1994). "More straw". Retrieved on October 8, 2015.
  3. Jason Summers' jslife pattern collection. Retrieved on January 5, 2020.
  4. Martin Grant (November 28, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  5. Matthias Merzenich (August 1, 2015). "Re: Soup search results". Retrieved on September 18, 2015.
  6. Martin Grant (July 31, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  7. Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
  • 17P8.1 at Heinrich Koenig's Game of Life Object Catalogs
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