Tail

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Tail
x = 2, y = 3, rule = B3/S23 o$o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ HEIGHT 600 WIDTH 600 THUMBSIZE 3 ZOOM 60 ]]
Pattern type Still life component
Number of cells 4
Bounding box 2 × 3
Discovered by Unknown
Year of discovery 1970

Tail (sometimes referred to as L or J) is a tetromino and great-grandparent of the beehive. It can often be attached to still lifes to create a larger still life. Even more important are the ways in which it may be attached to a marginally stable object of any kind to obtain overall stability while suppresing (or possibly exploiting) its own spark. The simplest such example is eater 1, in which a tail and a pre-block mutually stabilize one another. A tail can also stabilize one end of a fuse (e.g. as in eg. fuse with two tails).

As a still life component

A green background indicates that the object the tail is added to is stable without it; a red background indicates this is not the case.

Object Population Other part
Eater1.png Eater 1 7 Preblock.png Pre-block
Tubwithtail.png Tub with tail 8 Tub.png Tub
Hookwithtail.png Hook with tail Prepreblock.png Hook
Cisboatwithtail.png Cis-boat with tail 9 Boat.png Boat
Transboatwithtail.png Trans-boat with tail
Longhookwithtail.png Long hook with tail Preprepreblock.png Long hook
Hat.png Hat Unnamed
Cisbargewithtail.png Cis-barge with tail 10 Barge.png Barge
Transbargewithtail.png Trans-barge with tail
Beehivewithtail.png Beehive with tail Beehive.png Beehive
Clawwithtail.png Claw with tail Claw.png Claw
Cisverylonghookwithtail.png Cis-very long hook with tail Pre4block.png Very long hook
Transverylonghookwithtail.png Trans-very long hook with tail
Loop.png Loop Unnamed

Long^3 tail

Long3 tail refers to two unstable objects (cis and trans versions). Their significance is as a component of other objects, including the still lifes trans-tub with long3 tail, cis-tub with long3 tail, trans-boat with long3 tail and cis-boat with long3 tail, each of which uses a stable object that shares the cell at the end of the tail.

x = 4, y = 6, rule = B3/S23 3bo$3bo$2bo$bo$o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 400 WIDTH 600 THUMBSIZE 2 ZOOM 36 ]]
Trans long3 tail
(click above to open LifeViewer)
RLE: here Plaintext: here

Long^4 tail

Long4 tail refers to two unstable objects (cis and trans versions). Their significance is as a component of other objects, including the still lifes tub with long4 tail, cis-tub with long4 tail and trans-tub with long4 tail, each of which uses a stable object that shares the cell at the end of the tail.

x = 5, y = 7, rule = B3/S23 4bo$4bo$3bo$2bo$bo$o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 400 WIDTH 600 THUMBSIZE 2 ZOOM 36 ]]
Trans long4 tail
(click above to open LifeViewer)
RLE: here Plaintext: here

See also