Loading dock

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Loading dock
x = 9, y = 8, rule = B3/S23 4bo$2b3o$bo3b2o$ob2o3bo$bo3b2obo$2b2o3bo$4b3o$4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 ZOOM 24 LOOP 3 ]]
Pattern type Oscillator
Oscillator type Billiard table
Number of cells 22
Bounding box 9 × 8
Period 3 (mod: 3)
Heat 2.7
Volatility 0.17 | 0.17
Kinetic symmetry .e
Rotor type Six Ls
Discovered by David Buckingham
Year of discovery 1972

Loading dock is a period-3 oscillator that was found by David Buckingham in September 1972.[1]

It has a stator variant with larger population but smaller bounding box, named six Ls due to one phase consisting of six L-tetrominoes (tails), as shown below.

x = 7, y = 8, rule = B3/S23 3bo$b3o2bo$o3b3o$3o$4b3o$3o3bo$o2b3o$3bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 2 ZOOM 24 LOOP 3 AUTOSTART ]]
six Ls
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere

Synthesis

A 14-glider synthesis for loading dock and a 20-glider synthesis for six Ls were found by Jeremy Tan on March 29, 2019 based on soups submitted to Catagolue.[2] The latter was improved to 18 gliders by Mark Niemiec two days later.[3]

In December 2020, GUYTU6J found a 13-glider synthesis of a stator variant of this oscillator[4] based on a suggestion from gmc_nxtman dating to November 2015.[5] In January 2023, Chris857 found a 10-glider synthesis of that stator variant as well as a 17-glider synthesis of six Ls.[6] In January 2023, Carson Cheng found a 10-glider synthesis of six Ls tying the cost of the other stator variant.[7] On September 3, 2023, May13 found a 12-glider synthesis of loading dock.[8]

References

  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Jeremy Tan (March 29, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  3. Mark Niemiec (March 31, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  4. GUYTU6J (December 27, 2020). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  5. gmc_nxtman (November 17, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  6. Chris857 (January 2, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  7. Carson Cheng (January 18, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  8. May13 (September 3, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums

External links