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 [[ THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACK -1/12 -1/12 THUMBSIZE 2 HEIGHT 480 X 7 Y 5 Z 8 GPS 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. It consists of a switch engine reacting with blocks to create an infinite number of new blocks (eight new blocks every 288 generations).

It is the most common naturally-occurring pattern that exhibits infinite growth, and is one of only two patterns that exhibits infinite growth that has been known to occur naturally (the other being the glider-producing 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.[1]


The block-laying switch engine is the sixty-fourth most common object on Adam P. Goucher's Catagolue.[2]

Image gallery

The blocks left behind by the block-laying switch engine
A simple predecessor of the block-laying switch engine
RLE: here


  1. "Mosquito 1". The Life Lexicon. Stephen Silver. Retrieved on June 1, 2009.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.

External links