Citing the stars and the sea

I notice in my work I use outer space and the sea a lot to form poetic analogies. This is a common theme in writing, but it was very apparent to me in the song below. Why do I think these themes crop up in my work?

There is a certain romanticism and mystery to both space and the sea. These vast bodies exist outside of our land dwelling comforts, and in comparison are giants dwarfing the world in which we regularly reside. And, as in often times, I write about my experiences with the opposite sex. Well for me they can be as elusive and as dwarfing as both space and the sea.

Again (structurally) an odd song so I have organized with three parts and a bridge. I enjoy the internal rhyming in this song, it was fun to produce. I also played with (if I remember correctly) assonance and consonance.

On Arrival

Part 1
The clouds look photo-shopped in;
The damage is on the outside-in.
If I awake first then I'm certain to win,
But as for the prize,
Surprise me.

In the light you seem slimmer;
My hands appear weaker,
As we dance to the drone of
A busted out speaker.

We stand as still as statues
And wait for the shutter to close.

Are you alive?
Am I a ghost?
Have we arrived yet?

Part 2
The sound is a lifetime away.
It echoes around like a radio wave
Traveling through the absence of space.
Can you hear it?
It's all around us.

In the dark you seem brighter;
My wit becomes sharper.
It cuts through your clothes
Like a boat through the harbor.

The covers all flap on the bed
Like waves cresting the coast.

Are you alive?
Am I a ghost?
Have we arrived yet?
Nobody knows...

Bridge
Maybe the truth is irrelevant.
If I could use my hands to get
Inside your mind,
No telling what I'd find.

In our youth we are compelled by love,
But now its waning on the passage of
Our time,
And no one seems to mind.

Are you alive?
Am I a ghost?
Have we arrived yet?

Part 3
Now the colors are all changing their hues;
A subtle difference in all of the blues.
You tilt your head but you get the same view,
Just perpendicular
To the first one.

In the day it seems duller;
By night a strong hunger.
It feeds off the feeling:
"Why can't I feel younger?"

If the moon and the stars and the planets
All align and explode...

Are you alive?
Am I a ghost
Have we survived this?
Nobody knows.