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
cricket
praying mantis
I am usually here. I'm never there. I sit and think very, very slowly. Then I move very slowly there. I eat leaves and think extensively on how not to move.
If I don't move, no one can see me.  I've only eaten fairies so far today, I could really use a cricket. I would caution you, Mantis. I am friends with this bee. I want no trouble here. I'm sick and tired of fairies and their garbage. Mantis?  There is no mantis here.  But just for fun, could you take one step closer? I'd prefer I didn't move, to be honest. I'm comfortable where I am at. Perhaps you are interested in taking a nice nap while I have a walk around.