obo! spark
(Redirected from Obo!)
| obo! spark | |||||||||
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| Pattern type | Spark | ||||||||
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| Number of cells | 2 | ||||||||
| Bounding box | 3 × 1 | ||||||||
| Static symmetry | D4_+1 | ||||||||
| Discovered by | John Conway | ||||||||
| Year of discovery | 1969 | ||||||||
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An obo! spark is a spark of the form O.O, so called after its RLE encoding, shown below:
x = 3, y = 1, rule = B3/S23 obo!
It is a combination of 2 dot sparks separated by an empty cell orthogonally.
Notably, obo! sparks cannot occur at the edge of a pattern's envelope without cells having been in that column beforehand, which is why all of the sparkers use non-edgy predecessors like the one shown below.
| A common parent of the obo! spark, which appears in both Beluchenko's p40 and p76 pi-heptomino hassler (click above to open LifeViewer) RLE: here Plaintext: here |
See also
- Pole 2 (as a rotor, or an oscillator in the isotropic non-totalistic rule B2-i/S)
- Corner dot, which shares many similarities and often overlaps
- obo sparkers (category)
External links
- obo spark at the Life Lexicon