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A '''kickback''' is any of the two [[2-glider collision]]s resulting in a single glider travelling in the opposite direction to one of the original gliders. In a '''90-degree kickback''', the two gliders collide at right angle, while in a '''180-degree kickback''' they are head-on. Both output gliders are one [[half-diagonal]] away from the [[lane]] of one of the inputs.
A '''kickback''' is any of the two [[2-glider collision]]s resulting in a single glider travelling in the opposite direction to one of the original gliders. In a '''90-degree kickback''', the two gliders collide at right angle, while in a '''180-degree kickback''' they are head-on. Both output gliders are one [[half-diagonal]] away from the [[lane]] of one of the inputs.


The 90-degree kickback is important in the original proof of the existence of a [[universal constructor]] (using an [[elbow ladder]]) and in [[Bill Gosper]]'s [[total aperiodic]], as well as a number of other constructions and [[glider syntheses]]. Thus the term '''kickback reaction''' may also refer to the 90-degree one specifically. The 180-degree kickback is rarely used in [[signal]] [[circuit]]ry or in self-supporting patterns like the [[Caterpillar]] or [[Centipede]], because it is generally less easy to arrange. However, as discovered by [[David Bell]], it can be used to create high-perod oscillators.
The 90-degree kickback is important in the original proof of the existence of a [[universal constructor]] (using an [[elbow ladder]]) and in [[Bill Gosper]]'s [[total aperiodic]], as well as a number of other constructions and [[glider syntheses]]. Thus the term '''kickback reaction''' may also refer to the 90-degree one specifically. The 180-degree kickback is rarely used in [[signal]] [[circuit]]ry or in self-supporting patterns like the [[Caterpillar]] or [[Centipede]], because it is generally less easy to arrange. However, it can be used to create high-period oscillators.
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{{EmbedViewer
|rle = x = 242, y = 245
|rle = x = 242, y = 245
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|viewerconfig = #C [[ THUMBNAIL THUMBSIZE 3 WIDTH 1000 HEIGHT 1000 GPS 20 THEME 6 GRID OFF AUTOSTART T 0 PAUSE 2 T 49 PAUSE 1 LOOP 50 ]]
|viewerconfig = #C [[ THUMBNAIL THUMBSIZE 3 WIDTH 1000 HEIGHT 1000 GPS 20 THEME 6 GRID OFF AUTOSTART T 0 PAUSE 2 T 49 PAUSE 1 LOOP 50 ]]
|position    = center
|position    = center
|caption      = A p4284 oscillator based on the 180˚ kickback reaction.
|caption      = A p4284 oscillator based on the 180˚ kickback reaction, made by [[David Bell]]<ref name="post176279" />
}}
}}


==References==
==References==
<references>
<ref name="post176279">{{LinkForumThread
|format = ref
|p = 176279
|title = Oscillator discussion thread
|author = David Bell
|date = January 22, 2024
}}</ref>
<references />
<references />


Revision as of 01:18, 16 February 2024

x = 7, y = 12, rule = B3/S23 5bo$4bo$4b3o7$b2o$obo$2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 3 ZOOM 15 WIDTH 500 HEIGHT 400 GPS 20 THEME 6 GRID OFF AUTOSTART T 0 PAUSE 2 T 49 PAUSE 1 LOOP 50 ]]
The 180-degree kickback[1]
(click above to open LifeViewer)
RLE: here Plaintext: here
x = 7, y = 12, rule = B3/S23 5bo$4bo$4b3o7$bo$2o$obo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 3 ZOOM 15 WIDTH 500 HEIGHT 400 GPS 20 THEME 6 GRID OFF AUTOSTART T 0 PAUSE 2 T 49 PAUSE 1 LOOP 50 ]]
The 90-degree kickback[2]
(click above to open LifeViewer)
RLE: here Plaintext: here

A kickback is any of the two 2-glider collisions resulting in a single glider travelling in the opposite direction to one of the original gliders. In a 90-degree kickback, the two gliders collide at right angle, while in a 180-degree kickback they are head-on. Both output gliders are one half-diagonal away from the lane of one of the inputs.

The 90-degree kickback is important in the original proof of the existence of a universal constructor (using an elbow ladder) and in Bill Gosper's total aperiodic, as well as a number of other constructions and glider syntheses. Thus the term kickback reaction may also refer to the 90-degree one specifically. The 180-degree kickback is rarely used in signal circuitry or in self-supporting patterns like the Caterpillar or Centipede, because it is generally less easy to arrange. However, it can be used to create high-period oscillators.

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A p4284 oscillator based on the 180˚ kickback reaction, made by David Bell[3]
(click above to open LifeViewer)

References

<references> [3]

  1. ↑ Robert Wainwright (March 1971). Lifeline, vol 1, page 4.
  2. ↑ Robert Wainwright (September 1973). Lifeline, vol 11, page 10.
  3. ↑ 3.0 3.1 David Bell (January 22, 2024). Oscillator discussion thread (discussion thread) at the ConwayLife.com forums
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