Thank you for perfect answers! Seems like a binary symmetry plays some role in this game because both configs are so. And I am amazed that Period-156 has a quadro symmetry!!! (at least if I refuse to consider it as a static image).
Are there any configs (I mean, those having any interesting behaviour) with intention having more than 4 symmetry parts? Or at least just more quadro symmetry configs? I am absolutely sure (since today) there are some for any 2^n, just all unfound.
Any attemts to create Conway's life on hexagon map with apropriate rules?
upd: for a single stream of gliders, what config gives as many gliders per 100 generations as possible? No matter what else it does, I just want a line of gliders with as little space as possible.