What is the purpose of the mysterious "wind" or "fan"-like platform outside Bazaar?

Around the Bazaar, there is a flat indentation in the grass that looks like it has some sort of purpose, but I'm coming up on the end of the game and can't find anything to do with it.

It's basically a white square with rounded edges with a green clover-like imprint on it. It looks almost like a fan. Here's some pictures:

Does it have any purpose? There are none other like it in the game that I have found.

They serve no purpose, they are just merely the skylights for the houses they are above. Notice at night, it is a lot brighter from the outside. That's because of the lights inside shining out. If you look from the inside, it should be pretty clear that they are skylights:

Skylights at night from inside Kukiel's house

They are probably all designed that way to go with the Skyloft theme of having fans (and fan-shaped objects) everywhere.