The boat is the only still life with 5 cells and was discovered by the JHC group in 1970.[1] It can be thought of as a tub with an extra cell in one of the corners, or a ship with one of the corner cells removed. Like the tub and the ship, it is infinitely extensible (see long boat).

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Pattern type Strict still life
Number of cells 5
Bounding box 3×3
Frequency class 2.8
Discovered by JHC group
Year of discovery 1970

The boat can be hit by a glider to cleanly produce another glider, travelling perpendicular to the direction of the input glider. It is thus a one-time reflector.


The boat is the fourth most common still life in Achim Flammenkamp's census, being slightly less common than loaf and over four times as common as tub.[2] It is also the sixth most common object on Adam P. Goucher's Catagolue.[3]

gollark: I think they're at HTech™ Apiary Division j3K0hRk, which is in an unknown location.
gollark: Tux-3 and Tux1 are merely members of the set ∀N∈ℝ TuxN.
gollark: No, it's Tux-3.
gollark: This is looking increasingly suspicious.
gollark: Their initial edit got reverted.

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
  2. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
No corners (barges) (^-2) • (^-1) • ^0^1^2^3^4^5^6 • ^7 • ^8 • ^9
One corner (boats) (^-2) • (^-1) • ^0^1^2^3^4^5^6^7^8^9^10
Two corners (ships) (^-1) • ^0^1^2^3^4^5^6^7^8^9^10
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