See not what is visible but what is invisible 

For I am invisible but everyone can see me

I walk past unseen 

And still you know Im moving 

You can hear my voice in your head 

But you cant remember who said it

You might think I'm visible

And know that I love you,

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica Neue'; color: #454545}

But could you even tell me where my head is?