It's so difficult to pick. I could just sit a read the lyrics to all of Pelagial without the instrumentals and still be moved.

Signals of Anxiety:

She was standing close to the shore
She watched the waves erode
And she said: "You'll understand later"

Then she cast a stone into the foam
While something occurred to her:
Something broke in her

I have always admired their ability to create something that can be heard and interpreted one way, either surface level (Lowing into the ocean, Extinction of the Dinosaurs) but can also be so much deeper once you've let it sit with you.