Do you see it. 
There is a hook there. Miss Tina tied this Silk Dragon Fly Realistic, and this is one of the pair that was on Display at Orvis Richmond for Two Plus Years.
When I first posted this pic on our fly tying site, several folks didn't look close and asked when I was posting her fly.
Here is a view of the terrarium at the Orvis store. Not the best shot, but you get an idea.
1965-1969 - NRA Member - Henry H004, Henry H001