Author's note: Saturday morning drabble (blah blah blah). This piece is the answer to Morpheus' question- well, it's my answer.
Disclaimer: I don't own the Matrix.

How far does the the rabbit hole go down?
As far as a rabbit can dig!
No-
As far as the rabbit wants to.

The rabbit hole is train of thought.
The ground in which it is built is the mind;
And the rabbit-

It's you.

So,
How far do you want to dig?