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Star Wars, also known as MirekGro, is a Generations rule devised by Mirek Wójtowicz in March 1999. In this rule, a state-0 cell will become state 1 iff it has two state-1 neighbours. A state-1 cell does not change if it has 3, 4 or 5 state-1 neighbours, otherwise it will enter state 2 next tick and then state 3 before dying.
Named after its behaviour that resembles deep space battle scenes, the rule can be described as follows:
|“||StarWars is also an interesting rule from the low-investment standpoint. In particular, it is notable for the abundance, intricacy, and variety of its naturally-occurring glider guns. In general when running "au naturel" StarWars is active to a degree almost reminiscent of Brain, with the distinction that it likes to build fixed lego-like skeletal structures. In some orbits this latter penchant reaches its zenith, and we get large universe-spanning "shells" possessing an intricate radiate geometry.||”|
|— John Elliott|
Still lives of population 5, 8, 10, 12 and above exists. The only 5-cell still life is the X-pentomino, or cross, which is a common extendable segment in larger still lives.
A group of still lives in the shape of rectangular boxes are invincible from inside, limiting the evolution similar to a finite plane; for a m×n plane the exterior has a bounding box of (m+4)×(n+4). An example with m=n=16 is shown above at lower-right corner.
Due to the two dying states, oscillators of period 2 and 3 are impossible.
Many oscillators consist of one or more lightspeed signals, with a leading state-1 cell each, that are running on the surface of the stator. These oscillators are referred to as railroads because they look like trains running on railways. The mechanism provides at least one specimen for every period p ≥ 4. Specifically, jointing q copies of the X-pentomino orthogonally will give a still life with circumference 6q+6 cells (which has exactly one state-1 cell each in their Moore neighbourhoods). If 6q+6 = kp for some integer k, then k copies of the signal can be put in the circumference evenly to yield a period-p oscillator. The period-7 example is constructed accordingly.
The spaceships in Star Wars are all at c orthogonal, thus are also referred to as photons. The structure is extensible to various degrees.
Linear growth patterns
Technologies based on the smallest photon have been extensively developed. For instance, shooting the photon at the edge of a still life can split it into two lightspeed signals, which travel on the edge and merge into a photon elsewhere, or are turned into other signals. A small portion of photon conduits is shown above.
Further constructions are possible, for instance an adder.
- Jeremy Tan (March 22, 2015). An Amsterdam Adder (discussion thread) at the ConwayLife.com forums