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#C A period 30 pre-pulsar shuttle oscillator found in August 1980 x = 18, y = 11, rule = B3/S23 bo14bo$obo4bo7bobo$bo3b2ob2o6bo$7bo4$7bo$bo3b2ob2o6bo$obo4bo7bobo$bo 14bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ WIDTH 600 HEIGHT 480 THUMBSIZE 3 GPS 6 LOOP 30 ]]
Pattern type Oscillator
Oscillator type Shuttle
Number of cells 28
Bounding box 18 × 15
Period 30
Mod 15
Heat 22.4
Volatility 0.91
Strict volatility 0.91
Discovered by David Buckingham
Year of discovery 1980

Eureka (or p30 pre-pulsar shuttle) is a period-30 pre-pulsar shuttle oscillator in which two 15-generation pre-pulsar shuttle mechanisms each composed of two tubs hassle a pre-pulsar. It was found by David Buckingham on August 16, 1980.[1]

A slightly different period-30 shuttle can be created by shifting the top half of the shuttle two cells to the left or right (see below). This allows the outermost tubs to optionally be replaced by blocks.

x = 19, y = 11, rule = B3/S23 15bo$6bo7bobo$2o2b2ob2o6bo$2o4bo4$8bo$2bo3b2ob2o6bo$bobo4bo7bobo$2bo 14bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 400 WIDTH 600 THUMBSIZE 2 GPS 6 AUTOSTART LOOP 30 ]]
A skewed variant of Eureka with one tub replaced by a block
(click above to open LifeViewer)
RLE: here Plaintext: here

The first known semi-natural appearance of a version of this oscillator was in November 2014 in a soup found by Adam P. Goucher using apgsearch.[2] The monomerised version first occurred in March 2016.[3] A fourfold skewed version appeared in a soup by Charity Engine on February 5, 2022.[4]


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Adam P. Goucher (November 25, 2014). Re: Soup search results (discussion thread) at the forums
  3. praosylen (March 20, 2016). Re: Soup search results (discussion thread) at the forums
  4. David Raucci (February 5, 2022). Message in #cgol on the Conwaylife Lounge Discord server

External links


Variants on Adam P. Goucher's Catagolue (by end stabilisations):

Tub (and block) variants

Pentadecathlon variants

Other notable seminatural occurrences

  • Mutually supporting two queen bees on one end (cis- and trans- versions, trans- one involves much closer interaction)