Which country did the paper windmill originate from?

The windmill was first descended from the earth by aliens and saw a group of children playing with mud. At this time, an alien child came down from the flying saucer to play with human children. Seeing that all the children on the earth don't have to play, he said, I'll fold a paper windmill for you to play with, and then humans can play. In fact, the fluid mechanics of paper windmill is quite advanced. It is the core part of the top of the flying saucer and a gift from aliens to the earth.