Lyric discussion by paulywall 

Personally, I interpret the first verse as talking about how we've been here since the dawn of man, we've seen the Earth age and it is now approaching the end.

For example,

"Each shade of blue is kept in our eyes."

Many times, as the sun begins to set, because of the fading illumination of the sun on this side of the planet, the world begins to take on a constantly deepening shade of blue. Morning to noon to evening to night is often used to metaphorically connect to aging of our lives. I believe it's a metaphor for the beginning of the earth, the adolescence stage, the adult stage, and the ending stage. And how we've seen every sun set, every time the sky turns into a darker and darker shade of blue, someone has seen it, and it's burned in our memories through our eyes.

This is however, just my interpretation and I could be way off. :)

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