The Mouse and the Inbetween

"A mouse one day with eyes a gleam,
Tried to find the 'Inbetween.'
He looked about and saw it not.
Still curious, some help he sought."
A small mouse suddenly had a burning question to which he needed an answer. "Where can I find the 'Inbetween'?"
Little did he know his question would lead him to a place so vast, and yet, so simple. A place inside him that connected him to everything!