Twin bees shuttle
Twin bees shuttle  
View animated image  
View static image  
Pattern type  Oscillator  

Oscillator type  Shuttle  
Number of cells  28  
Bounding box  32×13  
Frequency class  38.2  
Period  46  
Mod  46  
Heat  32.5  
Volatility  0.98  
Strict volatility  0.94  
Discovered by  Bill Gosper  
Year of discovery  1971  
 
 
 

The twin bees shuttle (or Bheptomino shuttle^{[1]}) was found by Bill Gosper in 1971.^{[2]} 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 bigun, in which two twin bees shuttles collide with each other headon (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 3block 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 twoblock shuttle, however, has a cheaper glider synthesis, costing only 7 gliders instead of 8.^{[3]}
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.
The period92 doseedo reaction was found by David Bell in 1996.^{[4]} It is a 90 degree glider reflection reaction in which the gliders appear to circle around each other.
Commonness
On Catagolue, it is the most common period 46 oscillator, with all natural oscillators of that period featuring it in some form.^{[5]}
Image gallery
See also
References
 ↑ "Bheptomino shuttle". The Life Lexicon. Stephen Silver.
 ↑ Dean Hickerson's oscillator stamp collection.
 ↑ Adam P. Goucher. "cistwinbeesshuttle". Catagolue. Retrieved on May 24, 2019.
 ↑ "Doseedo". The Life Lexicon. Stephen Silver.
 ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
External links
 Twin bees shuttle at the Life Lexicon
 32P46.1 at Heinrich Koenig's Game of Life Object Catalogs
Catagolue
 Patterns
 Patterns with Catagolue frequency class 38.2
 Natural periodic objects
 Oscillators with 28 cells
 Patterns with 28 cells
 Patterns found by Bill Gosper
 Patterns found in 1971
 Patterns that can be constructed with 8 gliders
 Oscillators
 Periodic objects with minimum population 28
 Shuttles
 Oscillators with period 46
 Oscillators with mod 46
 Oscillators with heat 32
 Oscillators with volatility 0.98
 Oscillators with strict volatility 0.94
 Sparkers
 Sparkers with period 46
 Strong sparkers
 Domino sparkers
 Dot sparkers