Lyric discussion by Rolz 

Cover art for Head Down lyrics by Nine Inch Nails

I'm pretty sure most of the songs on the slip are about some kind of personality disorder Trent has experienced. It might have been enhanced for Trent because of all the drugs he did in the past, but things like this usually form on their own because of some type of trauma. I myself get this weird, empty feeling sometimes that the world is unreal and far away (and I don't do any drugs).