There is a door handle, on the wall, in our lecture room.
There is no door attached to it!!
So far the comments have been,
‘well at least we’ve got a handle on this lecture’
‘if we open that does the lecturer go away?’
‘that is one big door’
‘we’ve got a handle on the wall, well at least we’ve got a handle on something!’

Perhaps you have to experience this to understand it, but during two hours of pretty cloud skimming lecturing, a handle on the wall is just the most sublime image!