Middleweight volcano
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| Middleweight volcano | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Family | Volcano | ||||||||
| Number of cells | 47 | ||||||||
| Bounding box | 13 × 13 | ||||||||
| Period | 5 (mod: 5) | ||||||||
| Heat | 16.4 | ||||||||
| Volatility | 0.46 | 0.46 | ||||||||
| Kinetic symmetry | n | ||||||||
| Discovered by | Dean Hickerson | ||||||||
| Year of discovery | 1992 | ||||||||
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Middleweight volcano is a period-5 oscillator that was found by Dean Hickerson on April 6, 1992[1] that produces sparks much like a middleweight spaceship. Like the toaster, its sparker rotor is stabilized by another, separate rotor encased within the oscillator. In particular, one of their shared bushing cells has no other stator neighbors, and must rely only on the two rotors for its continued survival.
Synthesis
On July 7, 2021, MathAndCode and Aleph found the final step of a synthesis.[2] Three days later, Extrementhusiast completed it using a different final step, creating an 88-glider synthesis.[3] A reduction to 81 gliders was found in July 2023.[4][5] On June 18, 2025, KtT lowered the cost to 80 gliders.[6][7]
Gallery
| A half-middleweight volcano, found by Noam Elkies on 15 March 2000 (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here |
| A larger but higher-clearance mechanism (click above to open LifeViewer) Catagolue: here |
| A smaller variant of that, as used in the period-20 glider gun (click above to open LifeViewer) Catagolue: here |
| A different mechanism with a stronger spark (click above to open LifeViewer) Catagolue: here |
See also
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
- ↑ Aleph (July 07, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Extrementhusiast (July 10, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Carson Cheng (July 16, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#4661519515) (July 15, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
- ↑ KtT (June 18, 2025). Re: Still Life Synthesis Thread (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#10398280332) (June 19, 2025). Job triggered by Adam P. Goucher at GitLab Catagolue project.
External links
- MW volcano at the Life Lexicon
- Middleweight volcano at Adam P. Goucher's Catagolue
- 47P5.4 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
- Patterns
- Oscillators with 47 cells
- Periodic objects with minimum population 47
- Patterns with 47 cells
- Patterns found by Dean Hickerson
- Patterns found in 1992
- Patterns that can be constructed with between 80 and 89 gliders
- Oscillators
- Volcano variants
- Oscillators with period 5
- Oscillators with mod 5
- Oscillators with heat 16
- Oscillators with volatility 0.46
- Oscillators with strict volatility 0.46
- Oscillators with n symmetry
- Sparkers
- Sparkers with period 5
- Dot sparkers
- Strong sparkers