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Orthogonoid image
Pattern type Spaceship
Number of cells 467746
Bounding box 868856×707
Direction Orthogonal
Period 3476016
Mod Unknown
Speed 16c/217251
Heat Unknown
Discovered by Dave Greene
Year of discovery 2017

The Orthogonoid is a self-constructing spaceship analogous to the Demonoids, with a slow orthogonal direction of travel. The first example was completed by Dave Greene on 29 June 2017, with a top speed of 16c/217251 (this is just 256c/3476016 in lowest terms).

The construction recipe is a stream of MWSSes, with the recovery time limited to 90 ticks by the Lx200 dependent conduit that follows the initial syringe converter. The design is hashlife-friendly, meaning that the spaceship can be trivially adjusted so that spatial and temporal offsets are exact powers of two; period 4194304 and period 8388608 versions have been constructed, with speeds of c/16384 and c/32768 respectively. A script is available that can build any other sufficiently large Orthogonoid period.[1]

The MWSSes are converted to Herschels, which produce a standard single-channel glider stream that runs the Orthogonoid's single construction arm. After the child circuitry is complete, a previously constructed Snark in the parent is removed from the construction arm lane, converting it to a "destruction arm" that efficiently shoots down the previous constructor/reflector in the series as soon as it is no longer needed.

External links


  1. Dave Greene (February 3, 2018). "Re: Orthogonoid spaceship -- completed!". Retrieved on February 3, 2018.