Four boats

Four boats
3bo4b$2bobo3b$bob2o3b$obo2b2ob$b2o2bobo$3b2obob$3bobo2b$4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 THUMBSIZE 2 ]]
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Pattern type	Oscillator
Oscillator type	Babbling brook
	Billiard table
Number of cells	16
Bounding box	8×8
Frequency class	33.5
Period	2
Mod	2
Heat	4
Volatility	0.20
Strict volatility	0.20
Rotor type	Diagonal on-off
Discovered by	Unknown
Year of discovery	Unknown
Rules Outer-totalistic rules B3/S23 – B3678/S01235678 Important rules Conway Life, HighLife # of rules 29 = 512 Isotropic rules B3n/S2ckn3ckn – B2cik34-ejw5-c678/S01234-y5678
Glider synthesis Fewest gliders 6 Catagolue-generated RLE 4boats_synth.rle Uploaded synthesis RLE 4boats_synth.rle
Pattern files Plaintext 4boats.cells RLE 4boats.rle
Identifiers apgcode xp2_8ki1688gzx3421 Pentadecathlon ID 16P2.98

Four boats (or hourglass) is a period 2 oscillator, which is composed of four boats in one of its phases. It has two diagonal on-off rotors enclosed by a common stator. While the two rotors are not connected, the stability of the stator still requires them to be in the same phase. It is the most common billiard table osciillator that qualifies under the most strict definition of the term; that the rotor has to be completely surrounded by the stator in all orthogonal directions.

Image gallery

The on phase of this oscillator, the one which led to naming it four boats.

See also

• Harbor
• O quad-loaf
• Cyclic

External links

• 4 boats at the Life Lexicon

• Four boats at Adam P. Goucher's Catagolue

• 16P2.98 at Heinrich Koenig's Game of Life Object Catalogs