This is the sound of rhubarb growing in the dark. And someone really needs to take some sound samples to make a percussion track from it.
"Forced rhubarb" is a technique for growing fresh rhubarb in the Winter, while keeping it in pitch dark conditions. Done correctly, the plants grow super fast. Fast enough that you can hear it popping and creaking as it grows!
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.