This is from the song: better to fly sung by Swan Dive. But I don't get the blue line. Can you help me? What does that line mean?
Stuck inside this jet airliner
Rolling on a street of clouds
Watching as the red light's fading in and out
Really meant to write you a letter
Couldn't get past hello
Hoping that you'll understand and read it slow
Cause what I know
You could fit on the head of a pin
And I'm saying it over again and again
When you're up in the sky, it's better to fly
YouTube - Swan Dive: Better to Fly
I guess it means something similar to this:
fit on the back of a postage stamp - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.