As far back as their memories stretched they had met on Wednesdays to create galaxies. Pauline sometimes thought she remembered a Wednesday cave painting class several thousand years ago, but the other spirits said she was just being fanciful, and anyway Wednesdays didn't exist back then. It was also a mystery to them why it was so important to keep creating galaxies, although Francine suspected the answer to the mystery was MYSTERY, because when they went through a brief phase of not meeting and got regular jobs moving bits of paper around and stapling things to other things as people had always advised them to, the world suddenly became smaller, and some stars fizzled out before their time and fell into the sea.
Once the ocean had stopped shining and sizzling, those same people complained that things had become less sparkly and too known - not to mention all the magpies in the world, who love a bit of mystery and sparkle, took to a horrible wailing & flailing, and the Galaxy Creation Club was hurriedly reformed. The night before Wednesday (often, but not always a Tuesday), a shooting star would be sent by one of the spirits revealing the meeting place. This moved around so as not to annoy the neighbours, for sometimes the creations were loud and involved chanting and the banging of saucepan lids, and other times they were utterly silent but required bursts of bright light followed by bursts of dark light, and dark light can be very disconcerting if you aren't accustomed to it.
The locations were chosen in turn, because if Pauline had her way they would always be meeting in difficult to reach treehouses, or moonlit swamps which sound romantic but are also prone to vampirish insects, and Gregor found this very distracting while he was in the zone. In the zone they always muttered or sang or yelled or silently thought the ultimate words of creation, the words of their belonging and the binding of all things: KINGDOM OF KLAH ❇︎✺✬