So here's the dream: I'm in the driver's seat of a car, coming up to a huge truck.  It is so big that my car could fit under its carriage with plenty of room on both sides.  And that is what starts to happen--my car is moving slowly forward under this dark truck.  You might expect I'd put a stop to this, but I then realize that I have no steering wheel in front of me.  Instead I have a typewriter.  Not a computer keyboard: a typewriter.  And I'm typing as I observe the dark underside of the truck and feel it all around me.