This photo shows two classes going on. Trapeze class is in the front and the silks class (the pink and blue streamers) is toward the back.
Here is a closeup of some trapeze students:
And here are the silks students behind the trapeze students:
And here is a closeup of a silk student in the air:
If they fall, they have a thick mat on the floor but no nets. Scary, huh? Don't know if I'd be brave enough to try it!