"No ibu can be expelled from a bolo"

"The ibu is born in a bolo, it passes its childhood there, is taken care of when it’s ill, learns certain things, tinkers around, is hugged and stroked when sad, takes care of other ibus, hangs out, disappears. No ibu can be expelled from a bolo. But it’s always free to leave it and return. The bolo is the ibu’s home on our spaceship" ˧