There are dream beings who wonder, is this all there is?
Their curiosity plays tricks on them.
They want to find out more about how big their dream world is.
That’s why they capture and train giant air creatures.
Huts and watchtowers are built on these creatures and then, if the air currents are right, they leave.
Entire tribes go so that they can explore other worlds, and when these new worlds meet all requirements, homes are built on them.