Phi spark

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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.

Phispark.png A phi spark.
Phispark gen2.png Generation 1 reveals the origin of the name.
Phispark triangle.png A triangle is a common parent of the phi spark.
Phispark predecessor.png 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.

x = 45, y = 18, rule = B3/S23 16b3o$15bo3bo$15bo3bo$16b3o3$2bo11b2o7bo20bo$2o10bo4bo3b2o12b2o5b2o$b 2o9bo4bo4b2o9bo4bo4b2o$12bo4bo15bo4bo$14b2o17bo4bo$35b2o2$b3o$o3bo32b 3o$o3bo31bo3bo$b3o32bo3bo$37b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 3 LOOP 12 ZOOM 12 THUMBSIZE 2 PAUSE 2 T 11 PAUSE 2 HEIGHT 480 WIDTH 600 ]]
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