Pufferfish
| Pufferfish | |||||||||||
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| Pattern type | Puffer | ||||||||||
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| Number of cells | 44 | ||||||||||
| Bounding box | 15×12 | ||||||||||
| Direction | Orthogonal | ||||||||||
| Period | 12 | ||||||||||
| Speed | c/2 | ||||||||||
| Discovered by | Richard Schank | ||||||||||
| Year of discovery | 2014 | ||||||||||
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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.
Period-36 technology
- Main article: Pufferfish spaceship
On December 27, 2014 Ivan Fomichev found a non-trivial (dependent) c/2 fuse of period 36 for pufferfish's exhaust, enabling 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]
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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]
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.
References
- ↑ Richard Schank (November 24, 2014). "Re: Soup search results". Retrieved on November 25, 2014.
- ↑ Ivan Fomichev (December 27, 2014). "Pufferfish and companions". Retrieved on December 28, 2014.
- ↑ Nico Brown (December 29, 2014). "Re: Pufferfish and companions". Retrieved on December 29, 2014.
- ↑ Chris Cain (November 27, 2014). "Re: Soup search results". Retrieved on February 2, 2015.
- ↑ Ivan Fomichev (January 8, 2015). "Re: Pufferfish and companions". Retrieved on February 2, 2015.
- ↑ Chris Cain (February 10, 2015). "Re: Small Spaceship Syntheses". Retrieved on June 15, 2015.
External links
- Pufferfish at the Life Lexicon
- Pufferfish at Adam P. Goucher's Catagolue (linear growth)
- Patterns
- Patterns with 44 cells
- Patterns found by Richard Schank
- Patterns found in 2014
- Patterns that can be constructed with 15 gliders
- Linear growth
- Infinite growth
- Puffers
- Orthogonal puffers
- Puffers with period 12
- Puffers with speed c/2
- Patterns with bilateral orthogonal symmetry
- Semi-natural periodic objects
