Block-laying switch engine

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Block-laying switch engine
18bo10b$b3o8bo5bo10b$o3bo6bo7bo9b$b2o9b4o2b2o9b$3b2ob2o9b3o9b$5b2o11bo bo8b$19bo7b2o$19bo7b2o11$7b2o20b$7b2o20b7$15b2o12b$15b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 600 THUMBSIZE 3 ZOOM 12 X 5 Y 0 GPS 12 TRACKLOOP 576 -1/12 -1/12 ]]
Pattern type Puffer
Number of cells 43
Bounding box 29 × 28
Frequency class 19.6
Direction Diagonal
Period 288
Speed c/12
Discovered by Charles Corderman
Year of discovery 1971

The block-laying switch engine (or block-making switch engine) is a puffer that was found by Charles Corderman.[1] It consists of a switch engine reacting with blocks to create an infinite number of new blocks (eight new blocks every 288 generations).

The blocks left behind by the block-laying switch engine

Because of its easy construction (see the predecessor below), it has appeared in some superlinear growth patterns including mosquito 1 and mosquito 2.[2]


The block-laying switch engine is the sixty-fourth most common object on Adam P. Goucher's Catagolue. It is the most common naturally-occurring pattern that exhibits infinite growth, being more common than the glider-producing switch engine.[3]

11bobo2b$2o8bo5b$2o9bo2bob$13b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]
A simple predecessor of the block-laying switch engine
(click above to open LifeViewer)
RLE: here Plaintext: here


  1. Robert Wainwright (December 1971). Lifeline, vol 4, page 2.
  2. "Mosquito 1". The Life Lexicon. Stephen Silver. Retrieved on June 1, 2009.
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.

External links