**Size in bits:**
3 |
6 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
Larger |
Scrubbers

**Cost in gliders:**
2 |
3 |
4 |
5 |
6 |
1 glider/bit |
>1 glider/bit |
unknown

**Frequency of occurrence** |
**Methuselahs with P2 censuses** |
**Not quite oscillators**

Blinker [2] |

Toad [3] | Clock [4] | Beacon [3] |

Clocks have thumbs that can sometimes be used to suppress diagonal bit-sparks, allowing clocks to be used as rocks to stabilize some larger oscillators.

Toads have no stable surfaces, but one side vacillates between one and two bits, making it possible to form pseudo-objects with other toads or similar oscillators, or with even-period oscillators that create domino sparks, like the Figure-8.

Their other sides can also be placed between pairs of domino sparks in
several ways, resulting in two reactions: *toad-flipping*, where the toad
is reflected, and *toad-sucking*, where the toad is moved sideways one
position. Since each step must occur twice to return the toad to the original
period, this usually results in an oscillator of double the original period (or
quadruple, if the original period is odd). Several examples are shown in the
period 60 versions of a toad between
two pentadecathlons. Several additional
period 8 versions using
Figure-8s do *not* double the period,
because the Figure-8's domino sparks have an extra bit-spark that produces a
second domino hassling the toad twice in immediate succession each cycle.
Toad-sucking can also occur be done by pairs of
*c*/4 or
*c*/6 orthogonal spaceships
that produce domino sparks each time they advance. This could theoretically
also work with spaceships of any slower even base period that move one step each
period and produce one domino spark each period.

Pairs of toads, known as killer toads, can also eat expanding objects like middle-weight and heavy-weight spaceships, and forming 3/4 traffic light. These are most useful for eating spaceship streams whose period is a multiple of 2. For those whose period is a multiple of 3, killer candelfrobras are more appropriate.

Bipole [5] |

Tripole [7] |

Quadpole [6] |

Pentapole [10] |

Up beacon on table; Cis- beacon and table [6] | 12-bit P2 #1 [18] | Fox; Gnome [12] | Down beacon on table; Trans- beacon and table [6] | Phoenix [10] | Hexapole [12] |

Byflops; Butterfly; Griddles on two Ys [21] | Bipole tie boat [8] | Heptapole [16] |

Due to space limitations, these and their syntheses are shown on a separate page.

Due to space limitations, these and their syntheses are shown on a separate page.

Due to space limitations, these are shown without syntheses on a separate page. Syntheses for 9 of them are shown here.

Due to space limitations, these are shown without syntheses on a separate page. Syntheses for 8 of them are shown here.

Due to space limitations, these are shown without syntheses on a separate page. Syntheses for 2 of them are shown here.

Beacon on bookend siamese long integral [12] | Up beacon on down dock w/ down mango [6] |

Test tube baby between cis snakes [30] | Test tube baby between trans snakes [30] | Two blocks on armpit [10] | Two eater tails on butterfly [15] |

(* *Q: How many gliders does it take to screw in a light bulb?
A: 11-30, depending on the socket.)*

Test tube baby between snake and house [11] | Block and down long boat on armpit [12] |

Pistons are infinitely extensible. Pistons of any even length can be made by starting with the double piston synthesis, and adding as many additional copies of down-beacon-on-table as necessary for the desired length. (The first one is easiest, e.g. the quadruple piston; all others can use the method to extend this to the sextuple piston). Pistons of any odd length can be made by shortening an even-length piston by one unit, e.g. the triple and quintuple pistons.

NOTE: Because there are so many scrubbers, they are omitted from this list, and shown in the next section.

The Scrubber is a billiard table oscillator consisting of a traffic light predecessor surrounded by induction coils. There are many different ways to stabilize the exterior sides. Here are several synthesizable variations.

Glasses are pairs of scrubbers with out-of-phase spark coils between them.

Blinker [2] |

Toad [3] | Beacon [3] |

Toads have no stable surfaces, but one side vacillates between one and two bits, making it possible to form pseudo-objects with other toads or similar oscillators, or with even-period oscillators that create domino sparks, like the Figure-8.

Their other sides can also be placed between pairs of domino sparks in
several ways, resulting in two reactions: *toad-flipping*, where the toad
is reflected, and *toad-sucking*, where the toad is moved sideways one
position. Since each step must occur twice to return the toad to the original
period, this usually results in an oscillator of double the original period (or
quadruple, if the original period is odd). Several examples are shown in the
period 60 versions of a toad between
two pentadecathlons. Several additional
period 8 versions using
Figure-8s do *not* double the period,
because the Figure-8's domino sparks have an extra bit-spark that produces a
second domino hassling the toad twice in immediate succession each cycle.
Toad-sucking can also occur be done by pairs of
*c*/4 or
*c*/6 orthogonal spaceships
that produce domino sparks each time they advance. This could theoretically
also work with spaceships of any slower even base period that move one step each
period and produce one domino spark each period.

Pairs of toads, known as killer toads, can also eat expanding objects like middle-weight and heavy-weight spaceships, and forming 3/4 traffic light. These are most useful for eating spaceship streams whose period is a multiple of 2. For those whose period is a multiple of 3, killer candelfrobras are more appropriate.

Clock [4] | Spark coil [4] |

Clocks have thumbs that can sometimes be used to suppress diagonal bit-sparks, allowing clocks to be used as rocks to stabilize some larger oscillators.

Bipole [5] | Great on-off; Pincers [5] | Spark coil tie boat; Boat on spark coil [5] |

At present, the technology for synthesis of oscillators containing large number of disconnected bits is sorely lacking.

These all have a period of 2 because of blinkers (and also, in Pike, a toad).

Eater tie beacon [11] |

**Related:**
period-2 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.

Copyright © 1997, 1998, 1999, 2013, 2014 by Mark. D. Niemiec.
All rights reserved.

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