What is the hidden substance?

Reliable when contained,
Framed on the wall
Like mercury.

All in flux is all in danger,
The stranger to stay
In shadow.

I pray, in wing and talon
I bate at every shift
In light

At rifts, I screech in alarm
If harm discerns
My exposed brood

I yearn the end of my quest
To rest on the breast
Of the great mythic unicorn

Named Security.

Can she be found
In this place of brutality?

Staring out past rooftop and treeline
Into the stoney-blue Illinois skies,
Waving like fields of heather,
Clouds in ever-shifting disguise:
Beauty is the lullaby that soothes
After the dark surprise.
Truth is the root that defiantly grows
Through the blackened ash of exposed lies.

In the consummation of Beauty and Truth,
Love inhales, and opens her eyes.

Light and sound.
Water and air.
Collisions and containments.
Gravity and propulsion.
Static resistance and dynamic flow.

Hidden wishes
In a state
Of constant flux.

As the dove departing from the ark
Sent out like a sonar ping
To the end and back again
With awareness under wing,
So these synchronicities increase
In both meaning and frequency
Reverberating as sound waves
Off the inner wall of shrinking
Time, closing in

Closer to the end,
Completion and consummation:
The eternal rock mountain.

Daniel 2