Difference between revisions of "Scrubber"
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Latest revision as of 00:01, 8 June 2019
Scrubber  
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Pattern type  Oscillator  

Oscillator type  Muttering moat  
Billiard table  
Number of cells  28  
Bounding box  11×11  
Period  2  
Mod  2  
Heat  4  
Volatility  0.13  
Strict volatility  0.13  
Rotor type  Tub onoff  
Discovered by  Unknown  
Year of discovery  1971  
 
 
 

Scrubber is a period 2 oscillator that was found in 1971. It is a billiard table configuration with a 4cell onoff rotor. If its nucleus, a ring of four triminoes, is not constrained it will expand after two generations into a traffic light. Two covers are the smallest option for induction coils.
Placing two nuclei side by side is a form of constraint. Separated by the width of a single cell they can be packed rather arbitrarily into a square lattice, for which an overall constraint is still necessary. (Such an arrangement is shown at Agar#Tile_agars.) The interiors of nuclei separated by the width of two cells are still protected, but the nuclei act like spark coils. Glasses constitutes a binary instance of the arrangement, which can be elaborated as much as desired within a square lattice. The overall figure has period 2, but the relation between the interior and exterior phase must be respected. Boundary constraint is still required. Incommensurability of the widths would preclude mixing single and double spacing except along a linear chain which could even be bounded by spark coils.
In other rules
The scrubber can exhibit at least eight different evolution sequences across certain nontotalistic rules, allowing it to have any period from at least period 1 to period 8.^{[1]}
See also
References
 ↑ wwei23. Re: Random posts (discussion thread) at the ConwayLife.com forums
External links
 Scrubber at the Life Lexicon
 28P2.17076 at Heinrich Koenig's Game of Life Object Catalogs
 Patterns
 Oscillators with 28 cells
 Patterns with 28 cells
 Patterns found in 1971
 Patterns that can be constructed with 10 gliders
 Oscillators
 Periodic objects with minimum population 28
 Muttering moats
 Billiard tables
 Oscillators with period 2
 Oscillators with mod 2
 Oscillators with heat 4
 Oscillators with volatility 0.13
 Oscillators with strict volatility 0.13
 Oscillators with rotor Tub onoff
 Patterns with rectangular diagonal symmetry
 Seminatural periodic objects