Resemblance of behavior and shape in patterns

[alex79]

The thing between the B-Heptomino precursor is the object inside a roteightor's eaters.

[mniemiec]

The rotating thing in the middle of the roteightor has sometimes been called an "underweight spaceship", because it is even smaller than the light-weight spaceship. It doesn't work by itself, because it's too short for one side to over-populate itself to death (as it does with the LWSS, MWSS, and HWSS). An eater, however, can do this. Unfortunately, one can't bring in enough eaters close enough to allow this to run down a channel of eaters. However, since the UWSS is symmetrical, it's just as easy to flip it diagonally while eating it, and since it also flips orthogonally, this results in a 90-degree rotation, which is the basis for the roteightor.

[alex79]

Well, when stabilized with eaters it displays the thin and dense phases of a normal standard spaceship, and the B-heptomino moves like a normal standard ship until collisions with its junk turn it around and eventually destroy it. In fact in Drylife where L, M, and HWSSs cannot exist the B-heptomino is a straight-moving dirty puffer that can be stabilized into a ship with a blinker.