Trans-boat trans-line hook is an 12-cell still life.
This still life is comprised of a normally stable boat and a normally unstable hook connected by a line. This is one of two possible isomers, named trans due to the corner part of the boat facing outwards from the line; the other isomer, cis-boat trans-line hook, has this corner part tucked inwards.
The closely related pattern boat cis-line hook is an induction coil, in much the same way as the integral is a still life whereas the house is an induction coil. Note that there is only one valid isomer for the cis-line arrangement, analogous to cis-boat trans-line hook, as the trans- arrangement would cause unwanted birth between the boat and hook.
Among still lifes with 12 cells, this is the 57th most common still life according to Catagolue. Its position among all still lifes of all populations as a whole, however, is currently unknown.
All strict still lifes with a population of 22 or fewer cells, all oscillators with 16 or fewer cells, and all spaceships with 31 or fewer cells are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.
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