A phi spark is a commonly seen (for example, during the evolution of a Herschel) large symmetric spark that dies in 9 generations. It gains its name from resemblance of its generation 1 to a Greek capital letter phi (Φ).
The pentadecathlon splits into two phi sparks during its cycle for the span of five generations; their central halves regenerate the oscillator, while the outer halves die as usual.
|A phi spark.|
|Generation 1 reveals the origin of the name.|
|A triangle is a common parent of the phi spark.|
|A 7-cell pattern arising from a Herschel, which becomes a phi spark in 8 generations (a triangle in 7).|
Phi sparks can interact with gliders.
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