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Pseudo-barberpole image
Pattern type Oscillator
Oscillator type Muttering moat
Family Barberpole
Number of cells 15
Bounding box 12×12
Period 5
Mod 5
Heat 16.8
Volatility 0.82
Strict volatility 0.82
Discovered by Achim Flammenkamp
Year of discovery 1994

The pseudo-barberpole (or Achim's p5) is a period 5 oscillator that was found by Achim Flammenkamp on August 22, 1994.[1] With a minimum population of 15 cells, it is the smallest known period 5 oscillator, followed by octagon 2 with 16 cells.[2][3] On October 23, 2002 Gabriel Nivasch found a period 5 oscillator that consists of four radially symmetrically arranged halves of the pseudo-barberpole.[4]


Goldtiger997 found a 16-glider synthesis based on a sample soup from Adam P. Goucher's Catagolue on April 22, 2017.[5] Martin Grant found an unrelated 13-glider synthesis that can also act as a component on June 20, 2018.[6]

Image gallery

A radially symmetric relative of the pseudo-barberpole
RLE: here

See also


  1. Dean Hickerson's oscillator stamp collection.
  2. Mark Niemiec (1998). "Life Period-5 Oscillators". Retrieved on February 15, 2009.
  3. "Class 2 Objects Catalog". Retrieved on March 14, 2009.
  4. Jason Summers' all-osc pattern collection.
  5. Goldtiger997 (2017-04-22). "Re: Soup search results". forums. Retrieved on 2017-04-23.
  6. "Synthesising Oscillators". Retrieved on October 24, 2018.

External links

  • 15P5.1 at Heinrich Koenig's Game of Life Object Catalogs