Octagon 2 was the first known period-5 oscillator, discovered in 1971 independently by Sol Goodman and Arthur Taber; the name is due to the latter. Its discovery was first reported in Lifeline Volume 1.
An octagon 2 can be used as a block catalyst on each side to skip a phase.
Octagon 2 is about the twenty-sixth most common naturally-occurring oscillator in Achim Flammenkamp's census, being about as common as unix. On Catagolue, it is the most common period 5 oscillator, being more common than fumarole.
In even 8-fold symmetry (D8_4), it is the nineteenth most common object and the fifth most common oscillator, appearing in 1 in 80 soups.
A 5-glider synthesis for this oscillator was found and submitted to Catagolue by an unknown user in May 2022.
In other rules
In B3-a/S23, this pattern skips a phase and becomes a period 4 pattern.
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
- ↑ Robert Wainwright (March 1971). Lifeline, vol 1, page 5.
- ↑ Heinrich Koenig (April 14, 2009). "New Oscillators". Game of Life News. Retrieved on October 6, 2021.
- ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
- ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
- ↑ Adam P. Goucher (May 6, 2022). "shinjuku (#2425153643)". GitLab. Retrieved on May 13, 2022.
- 16P5.1 at Heinrich Koenig's Game of Life Object Catalogs