I don't think you understand
what I mean, when I say
I am a fifth wheel. I don't mean
I am always on the side,
I don't mean
I am completely unnecessary,
I don't mean you don't want me here.
All I mean is that, much like a car,
where the fifth wheel is backup,
I am your insurance
against having less than four.
Essential, but not inherently an essential part
of the basic structure.