Four boats
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Four boats  
View animated image  
View static image  
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 onoff  
Discovered by  Unknown  
Year of discovery  Unknown  
 
 
 

Four boats (or hourglass^{[1]}) is a period 2 oscillator, which is composed of four boats in one of its phases. It has two diagonal onoff 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
See also
References
 ↑ Mark D. Niemiec. "Life objects sorted by name". Retrieved on April 30, 2009.
External links
 4 boats at the Life Lexicon
 16P2.98 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Patterns with Catagolue frequency class 33.5
 Natural periodic objects
 Oscillators with 16 cells
 Patterns with 16 cells
 Patterns that can be constructed with 6 gliders
 Oscillators
 Periodic objects with minimum population 16
 Babbling brooks
 Billiard tables
 Oscillators with period 2
 Oscillators with mod 2
 Oscillators with heat 4
 Oscillators with volatility 0.20
 Oscillators with strict volatility 0.20
 Oscillators with rotor Diagonal onoff
 Patterns with rectangular diagonal symmetry