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 [[ 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).

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. It is the most common naturally-occurring pattern that exhibits infinite growth, being more common than the glider-producing switch engine.[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