Pufferfish/Snippet

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Pufferfish is a puffer discovered by Richard Schank in 2014. It consists of a pair of b-heptominoes whose debris is stabilised by a backend that travels at the same speed, c/2. It is the first known c/2 object that doesn't have any parts of periods 2 or 4. In 2014 Ivan Fomichev found a non-trivial (dependent) c/2 fuse of period 36 for pufferfish's exhaust, that enabled the assembly of the first wholly high-period c/2 spaceship and rake.