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
fairy interpreter
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.
Tweet tweet! why hello!  how are you? Oh fine. You can understand me? What a wonderful place this church is. yes its beautiful!  Is there anyone you need to talk to and need a transltion? Oy, my wife. I can never understand her. What is she doing now? Probably flying with that studly hawk who just moved into town. Really, I don't get her. you need to show her that you are king bird!  Be the boss!  Take a punch! I don't like punches! You knocked off all my feathers! I'm sorry!  I was trying to help! Now my wife will definitely leave me for the hawk. Could you talk to one of your fairies and get her to turn me into a dragon or something? You are amazing as a bluebird!  I'll send a message to the hawk to back off