B29

B29 is a c/4 diagonal spaceship discovered by Hartmut Holzwart in September 2004.[1] In generation 2 it produces an isolated domino spark that can be used to perturb reactions. In terms of its 29 cells, it is the fourth smallest c/4 diagonal spaceship, as well as the smallest c/4 spaceship to not exhibit glide symmetry. There are three ways in which a glider can non-trivially follow a B29, as shown below.

B29
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Pattern type Tagalong
Spaceship
Number of cells 29
Bounding box 10×17
Direction Diagonal
Period 4
Mod 4
Speed c/4
Speed (unsimplified) c/4
Heat 30
Discovered by Hartmut Holzwart
Year of discovery 2004

Due to a synthesis completed by Tanner Jacobi in April 2015,[2] B29 is one of relatively few elementary diagonal spaceships with a known glider synthesis.

Two gliders can be seen at the front of the ship, one of these being temporary and the other permanent, making this a tagalong. The other glider does not stay as a glider but still moves like one.

Three ways in which gliders can non-trivially follow a B29
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gollark: I wonder if some sort of dynamically-switchable channel content warning thing would be remotely doable.
gollark: Also this.
gollark: I mean, if I were being more consistent, which I probably should be, we should maybe... not have rule 4, in its current form? Probably the imagery bit due to things I already outlined, but better methods for handling "textual conversation which makes me uncomfortable" than just not having it which would generalize to other things.
gollark: Workplace-wise it is more visible from a distance, I think.
gollark: Imagery has more of that "horribly scarred for life instantly" thing going for it which you can probably avoid with text.

See also

References
  1. "B29". The Life Lexicon. Stephen Silver.
  2. Tanner Jacobi (April 5, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  • 29P4H1V1.1 at Heinrich Koenig's Game of Life Object Catalogs
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