Twin bees shuttle
|Twin bees shuttle|
|View animated image|
|View static image|
|Number of cells||28|
|Discovered by||Bill Gosper|
|Year of discovery||1971|
The twin bees shuttle (or B-heptomino shuttle) was found by Bill Gosper in 1971. Before the Snark was discovered, it and its variants were the basis of all known period-46 oscillators (the version at right being the smallest based on its minimum population of 28 cells), and until the discovery of Tanner's p46, the basis of all known true period 46 guns including the second known basic gun, new gun 1. The simplest such gun is the bi-gun, in which two twin bees shuttles collide with each other head-on (much like the collision of two queen bees in the Gosper glider gun).
There are numerous ways to stabilize the ends, two of which are shown to the right; a stabilization by two blocks on one end and one block on the other end. This 3-block stabilization produces the smallest possible shuttle in terms of its minimum population. This latter method produces a very large spark which is useful in a number of ways. For example, the large spark can be used to convert an incoming glider into a lightweight spaceship, as illustrated by double X. The image below shows David Bell's double block reaction (on the left), which results in a shorter but wider shuttle than usual, as well as Heinrich Koenig's hat stabilization (on the right). The two-block shuttle, however, has a cheaper glider synthesis, costing only 7 gliders instead of 8.
Interactions based on the twin bees shuttle are numerous and can have many applications. Some notable reactions are period 46 oscillators that can directly reflect gliders, lightweight spaceships, and middleweight spaceships, as well as convert gliders to lightweight spaceships and lightweight spaceships to middleweight spaceships.
A four-fold version of this oscillator first appeared semi-naturally in December 2014 in a soup found by Richard Schank. A monomerized version, specifically the cis isomer, later appeared in an asymmetric soup found by Brett Berger on April 16, 2015. The trans version first appeared on May 7 in a soup also found by Berger, and the three-block version first appeared on October 15 in a soup found by Tomas Rokicki. Other three-block versions, with one of the blocks placed further away, were found by Adam P. Goucher in July and September 2016.
- "B-heptomino shuttle". The Life Lexicon. Stephen Silver.
- Dean Hickerson's oscillator stamp collection.
- Adam P. Goucher. "cis-twin-bees-shuttle". Catagolue. Retrieved on May 24, 2019.
- "Do-see-do". The Life Lexicon. Stephen Silver.
- "Stop and go". The Life Lexicon. Stephen Silver.
- Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
- Richard Schank (December 19, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- Matthias Merzenich (April 16, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- gameoflifeboy (May 7, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- gameoflifeboy (October 15, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- Apple Bottom (July 16, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- Apple Bottom (September 26, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- 32P46.1 at Heinrich Koenig's Game of Life Object Catalogs