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
butterfly
I flutter around with my elaborately designed wings. I eat bugs and other small living items. Many people like to see me around them.
Your church is so amazing! Oh thank you dear butterfly.  I wish I could actually see it. Do you like my wings? Aren't they elaborate? Your wings are so beautiful. Almost as beautiful as mine!!  Do you want me to help you see my church? Your right. Your wings are incredible! Have you seen any humans near? No I haven't seen any humans today. I would love your help seeing it. Would you do that for me? Oh of course. Your wings are so beautiful, I'll do anything to see more of them! You are so sweet! Take this. Do NOT drop it! I'll hold onto it as if my life depends on it. You also need this. Gently rub the feather along the crystal ball 5 times.