The tunnel isn't even a metaphor.

The tunnel is a tunnel.

The black hole is a hole.

And, of course, passing through is passing through

Or not passing through is  

What interests me:

what forms a tunnel?

what pressures keep it?

what compels the matter through?

lines of equilibrium

phase boundaries

phase transitions

the heat or entropy of the solvent

the condition - why?

the crystal lattice breaks

and we lose her

following

as we are compelled to

as time could be a tunnel,

the fragility of matter: a kind of tunnel

following

as we are compelled to 

how long will our constituent parts hold?

what are they

- interesting? unassembled?

and what will they become after?

There is a coldness in the air.

Change is fine with indifference.

It is hard for us

who travel so.

Or, maybe,

 it isn't.