Be...Twix

I often dwell upon the word "betwixt"
And on the essence of that central space
Wherein all manner of strange things are mixed
Like the wacky thoughts in an ape's braincase.
Yet from ear to ear is just such a zone
Like pages that keep book covers apart
Or the marrow within a living bone
And the blood that pumps through the bravest heart!

Of course now the word is called obsolete
By current lexicographical masters,
But old Queen Bess would think them effete
And today's English use...as disasters.

Yet, she might not think it all that bizarre
For naming an existential candy bar!