Pufferfish

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Pufferfish
Pufferfish image
Pattern type Puffer
Direction Orthogonal
Period 12
Speed c/2
Number of cells 44
Bounding box 15×12
Discovered by Richard Schank
Year of discovery 2014

Pufferfish is a puffer discovered by Richard Schank in 2014. Having been found in a symmetric soup, the puffer is almost natural.[1] It consists of a pair of b-heptominos whose debris is stabilised by a backend.

It is the first known c/2 object that doesn't have any parts of periods 2 or 4.

On December 27, 2014 Ivan Fomichev found a non-trivial (dependent) c/2 fuse of period 36 for pufferfish's exhaust, that enabled him to assemble the first wholly high-period c/2 spaceship and rake.[2] A few days later Nico Brown found some smaller rakes.[3]

Pufferfish with a companion (p36 puffer)
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Pufferfish-based p36 spaceship
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Pufferfish-based p36 rake
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Synthesis

The second pufferfish-producing soup Richard Schank found resulted in a 15-glider synthesis proposed by Chris Cain.[4] On January 8, 2015 Ivan Fomichev made a p160 pufferfish breeder.[5]

Pufferfish breeder
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Chris Cain found a 60-glider synthesis of a pufferfish-based spaceship in February 2015.[6] Versions with arbitrarily increased length and population are trivially constructible at the same total cost in gliders.

Pufferfish spaceship synthesis
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References

  1. Richard Schank (November 24, 2014). "Re: Soup search results". Retrieved on November 25, 2014.
  2. Ivan Fomichev (December 27, 2014). "Pufferfish and companions". Retrieved on December 28, 2014.
  3. Nico Brown (December 29, 2014). "Re: Pufferfish and companions". Retrieved on December 29, 2014.
  4. Chris Cain (November 27, 2014). "Re: Soup search results". Retrieved on February 2, 2015.
  5. Ivan Fomichev (January 8, 2015). "Re: Pufferfish and companions". Retrieved on February 2, 2015.
  6. Chris Cain (February 10th, 2015). "Re: Small Spaceship Syntheses". Retrieved on June 15, 2015.

External links