Life Period-8 Oscillators

Size in bits: 12 | 15 | 17 | 18 | 21 | 23 | 24 | 25 | Larger
Cost in gliders: 4 | 6 | >1 glider/bit
Frequency of occurrence



The 1 twelve-bit period 8 oscillator

12b P8

Figure-8; Big beacon [4]

Figure-8 is the smallest oscillator that produces a period 8 (delayed) domino spark.


The 1 fifteen-bit period 8 oscillator

15b P8

Blocker [6]

The blocker is the smallest oscillator that produces a period 8 diagonal bit spark.


The 2 seventeen-bit period 8 oscillators

17-bit P8

Coe's P8; Tim Coe's P8 [8] Smiley [28]


The 1 eighteen-bit period 8 oscillator

18b P8

Flammen- kamp's P8 [13]


The 2 21-bit period 8 oscillators

21-bit P8

Down table on blocker [9] Up table on blocker [11]


The 8 23-bit period 8 oscillators

23-bit P8

Down blocker on cap [9] Down blocker on down long bookend [11] Up blocker on down long bookend [11] Up blocker on cap [11] Down blocker on up long bookend [11] Up Coe's P8 on table [13] Up blocker on up long bookend [13] Down Coe's P8 on table [13]


The 12 24-bit period 8 oscillators

24-bit P8

Down blocker on up long bookend w/ hook [14] Up blocker on up long bookend w/ hook [14] Up blocker on up long bookend w/ tub [14] Down blocker on up long bookend w/ tub [14] Down blocker on up long bookend w/ hook [14] Up figure-8 and trans mold sharing sparks [13]
Down blocker on up long bookend w/ tub [14] Up blocker on up long bookend w/ hook [16] Up figure-8 and cis mold sharing sparks [13] Up blocker on up long bookend w/ tub [16] Down figure-8 and trans mold sharing sparks [9] Down figure-8 and cis mold sharing sparks [9]


The 18 25-bit period 8 oscillators

25-bit P8

Down blocker on down long bookend w/ long hook [15] Down blocker on dock [12] Up blocker on down long bookend w/ down boat [13] Down blocker on down long bookend w/ down boat [13] Down blocker on down table w/ gull [11] Down blocker on down long bookend w/ up boat [14]
Up blocker on down table w/ gull [13] Up blocker on down long bookend w/ up boat [14] Down blocker on up long bookend w/ long hook [15] Up blocker on down long bookend w/ long hook [15] Up blocker on dock [12] Down blocker on up long bookend w/ down boat [13]
Down blocker on up table w/ gull [11] Down blocker on up long bookend w/ up boat [14] Up blocker on up long bookend w/ long hook [17] Up blocker on up long bookend w/ down boat [15] Up blocker on up table w/ gull [13] Up blocker on up long bookend w/ up boat [16]


20 period 8 oscillators 26 bits and larger

larger period 8 oscillators

Figure-8 and up mazing sharing sparks [9] Figure-8 and down mazing sharing sparks [12] Two trans blockers [16] Two cis blockers [16] Cauldron, Crucible [26-63]
28-bit P8 #1 [25] Kok's Galaxy [12] Toad sucked by two figure-8s #2 [17] Toad flipped by two figure-8s #2 [14] Toad flipped by two figure-8s #3 [17]
Toad sucked by two figure-8s #4 [14] Toad sucked by two figure-8s #3 [17] Toad sucked by two figure-8s #1 [12] Toad flipped by two figure-8s #1 [11] Tumbling T-tetson; Traffic light hassled by two figure-8s [10]
36-bit P8 oscillator [27] Hertz oscillator [11-14] Honeyfarm hassled by four eaters [14] Blocker rephasing P7 [69] Dual Hertz oscillator [20-24]

Kok's Galaxy is produces a period 8 diagonal bit spark.

(See notes under Toad for details about toad-flipper and toad-sucker oscillators.)



1 period 8 oscillator buildable from 4 gliders

4g P8

Figure-8; Big beacon [4]

Figure-8 is the smallest oscillator that produces a period 8 (delayed) domino spark.


1 period 8 oscillator buildable from 6 gliders

6g P8

Blocker [6]

The blocker is the smallest oscillator that produces a period 8 diagonal bit spark.


The 1 period 8 oscillator up to 25 bits costing >1 glider/bit

P8 gt.1g/b

Smiley [28]



The top 3 naturally-occurring period 8 oscillators

natural P8

Figure-8; Big beacon [4] (3.3e7) Blocker [6] (3.7e8) Coe's P8; Tim Coe's P8 [8] (1.7e10)

Figure-8 is the smallest oscillator that produces a period 8 (delayed) domino spark.

The blocker is the smallest oscillator that produces a period 8 diagonal bit spark.



Related: period-8 pseudo-oscillators.

Other oscillators by period: 2, 3, 4, 5, 6, 8, 10, 12, 14, 15, 24, 30, 36, 60, other.

Other types: still-lifes, pseudo-still-lifes, oscillators, pseudo-oscillators, oscillators by period, pseudo-oscillators by period, guns, multi-colored Life, basic spaceships and pseudo-spaceships, exotic spaceships, spaceships flotillae, puffers, constellations, methuselahs, not quite stable objects.

See also: Life objects sorted by: counts, frequency of occurrence, cost in gliders, name, size in bits, or type.

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This page was last updated on 2015-02-19.