Cis-mirrored long bookend is a 16-cell strict still life consisting of two mutually stabilising long bookends. It is one of five ways in which two long bookends can be arranged to create a still life.
This specific isomer is namedcis-mirrored due to the two inducting faces not being skewed from each other (hence mirrored), and the "denser" parts of each island are on the same side (hence cis). As such, it is the only one of the six with mirror symmetry.
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.
