Stand

I mentioned a few weeks ago that I'd read The Writer's Desk by Jill Krementz, a book of photographs of authors in their writing environments. As I was going through the book, I was surprised to learn that several of the authors prefer (or preferred, in the case of the writers who have died since the book was published) to stand while writing, leaning against lecterns or high tables and usually utilizing a notebook and a pen or pencil. Although I do tend to pace the room and read out loud as I edit, except for jotting down notes or bits of dialogue I've never written while standing; I've always sat at a desk or table or maybe on the couch, my computer in front of me or a notebook in my lap.

I'm curious now. How do you write? Do you ever stand, or do you find that you're most comfortable sitting (or even lying) down?