House bridge house is an 18-cell strict still life consisting of two mutually stabilising houses. It is one of three ways in which two houses can be arranged to create a still life, and the only one which only has a single island.
Having the two constituent houses in a mirror-symmetric arrangement gives mirrored house, whereas having them be skewed yet still disjoint yields rotated house.
The house bridge house can form when two relatives of pi-heptominoes collide, but pi-heptominoes themselves don't work.
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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