I am an invisible man.  No I am not a spook like those who haunted Edgar Allan Poe; nor am I one of your Hollywood-movie ectoplasms.  I am a person of substance, of flesh and bone, fiber and liquids – and I might even be said to possess a mind.  I am invisible, do you get that?  Because people refuse to see me.  Like the bodiless heads you sometimes see in sideshows.

Ralph Ellison “The Invisible Man” 1947