What's in my head?

You can't see it
Whatever it is
You can't tell what I know
Where I've been
Just by looking at me
Am I smart? Well read?
Am I "slow"? Can you tell?
Let's say I'm a book
What does my cover tell you?
Is my cover my skin?
Is it my clothes? My physique?
Have I read that book?
The one you hold so high
For all to see?
Have I met the author?
Read all his books?
You'll never know
Just by looking at me
And I'll never know
If all I've suggested is true
Just by looking at you
We're even then...