Pre-pulsar

The pre-pulsar is a common predecessor of the pulsar. It duplicates itself after 15 generations, although it fails to be a true replicator because of the way that the two copies then interact.

Pre-pulsar
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Pattern type Miscellaneous
Number of cells 16
Bounding box 9×3
Discovered by John Conway
Year of discovery 1970

A pair of tubs can be placed to eat half of the pre-pulsar as it replicates; this gives the period-30 oscillator Eureka, where the pre-pulsar's replication becomes a movement back and forth. The replication of the pre-pulsar can also be made to occur in just 14 generations as half of it is eaten; this allows the construction of period 28 and period 29 oscillators. The pre-pulsar was a vital component in the construction of the first oscillators of periods 26, 28, 29, 47, and 55.

A skewed pre-pulsar is like a pre-pulsar, however, the pre-traffic lights it is composed of are vertically skewed by two cells. Despite this it manages to replicate itself and becomes two skewed halves of a pulsar. This form, however, is unstable and so is not truly a pulsar predecessor, but it can be hassled similarly to a normal pre-pulsar by oscillators and spaceships.

Other pre-pulsar like formations, such as 3 in a row instead of 2, also duplicate themselves like the others, but are not stable.

A common four-generation predecessor of the pre-pulsar that consists of two T-tetrominoes
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A skewed pre-pulsar
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See also
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