In the weeks after their escape Bonesaw is hard at work, building up a lab and growing food and splitting branches and stitching them into a scaffold so that they grow into a living treehouse.
"Sure! I can make up a new song, then it'll be new to both of us."
She improvises something about colors seen by torchlight.
Bonesaw can learn it! She would also like to try improvising a bit herself, which isn't nearly as good.
How about she improvises but publicizes what she's thinking about the music so Beka can riff off it and make it sound nice?
Time passes - Kat grows, Bonesaw doesn't, and one evening a moon rises over the horizon.
"Wow, that's so pretty!" says Beka, who climbed up a tree to get a better look at it. Kat scrunches grumpily down in her pouch.
She can follow up the tree.
"Oh huh."
Bonesaw looks at the moon and feels homesick for the first time she came to this new world.
"That's the moon..."
"The one we had was really big and far away ... I'm not sure how it got there right though I suspect it didn't just appear one day like this one."
"I couldn't tell you. It's beautiful though! What does yours do, I think this one is moving..."
"It goes around the planet and also changes shape in a cycle. It comes up about once a day, usually during the night."
It does apparently, rising once a day just like Bonesaw's. After two weeks of this a much brighter golden orb appears in the sky.
"Wow, that one's bright! Look at all the colors! - Kat doesn't like it, poor baby." She tucks Kat deeper into her pouch.
"Oh it's the sun! We had one of those too!"
Bonesaw checks on Kat to see if she's scrunching up her eyes or if it's a skin thing or something else.