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Pseudo-barberpole image
Pattern type Muttering moat
Family Barberpole
Number of cells 15
Bounding box 12×12
Period 5
Mod 5
Heat 16.8
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]

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.

External links