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x = 14, y = 9, rule = B3/S23 b3o$o2bo6b3o$o4bo4bo2bo$3bobo2bo4bo$2o4bobobo$5bobo4b2o$3bo4bo$4bo5bo$ 9bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 4 0 -1/2 THUMBSIZE 2 GPS 4 ]]
Pattern type Spaceship
Number of cells 30
Bounding box 14 × 9
Direction Orthogonal
Period 4
Mod 4
Speed c/2
Speed (unsimplified) 2c/4
Heat 32.5
Discovered by Unknown
Year of discovery Unknown

30P4H2V0 is a spaceship that maintains a singly skewed D2_+2 symmetry — an extremely unusual symmetry both in Life and in 2D square-grid CAs in general — in three out of its four phases.

Glider synthesis

It is one of the relatively few spaceships that can be constructed by gliders, though the best available still-life constellation seed for the final construction stage (found by Tanner Jacobi on 10 September 2015[1]) is unusually complex.

Improvements to the synthesis have since been found.[2]


  1. Tanner Jacobi (September 10, 2015). Re: Thread For Synthesisable Spaceship Guns (discussion thread) at the ConwayLife.com forums
  2. iNoMed (May 11, 2021). Message in #cgol on the Conwaylife Lounge Discord server

External links

  • 30P4H2V0.4 at Heinrich Koenig's Game of Life Object Catalogs