Why did the Author choose to make the curtains blue?

Everyday in class I try to understand,
Life's big picture that is so grand.
To my English teacher,
The curtains are black-blue
Because the author wants them to.
This feeble talk of meaning has put me down under. 
My mind becomes awake as I drift into a slumber.
I fall into a world contaminated of black-blue, 
And I find myself questioning, who am I? Who are you? 
It is here in this vast loneliness
That I realize why I cannot rest.
I open my eyes 
And my curtains arise.
I learn
That education is what I yearn.  
Am I too late to say 
Thank you?