Traffic light

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Traffic light
2b3o2$o5bo$o5bo$o5bo2$2b3o! #C [[ THEME 6 GRID GRIDMAJOR 0 THUMBLAUNCH AUTOSTART ]] #C [[ LOOP 2 GPS 2 THUMBSIZE 2 ]]
Pattern type Constellation
Number of cells 12
Bounding box 9×9
Period 2
Mod 2
Heat 16
Volatility 0.80
Strict volatility 0.80
Discovered by Unknown
Year of discovery Unknown

The traffic light is a common formation of four blinkers and is the most common member of the familiar fours, also being the only one made from oscillators. A common predecessor is the T-tetromino. Although it behaves the same in some important non-standard rules such as HighLife as it does in standard Life, it does not appear nearly as frequently in many of those rules due to its common predecessors being unstable.[1]

Drawing a single cell in the middle of the traffic light while it is in its + phase will eat the whole traffic light leaving nothing behind.

See also


  1. HighLife - An Interesting Variant of Life by David Bell (.zip file)

External links