No one has actually seen it, but a fairy interpreter asked a fairy and they described it as just a cloud of smoke and once in a while you trip over something in the floor.  The fairies purposely leave their trash in the floor because they think it is funny when people trip over them.
Inside the fairies church, Inside Church
bee
bluebird
I am a bluebird that has made a nest in the castle walls. The king loves to listen to me sing every morning. My song fills the castle with music every day.
Hello there Hello, Bluebird. It's a nice day to buzz around and pollinate flowers. 