IT'S BEEN SEVEN MONTHS since I've been inside a prison cell. Now I'm back, sort of. The experience is eerily like my dreams, where I am a prisoner in another man's cell. Like the cell I go back to in my sleep, this one is built for solitary confinement. I'm taking intermittent, heaving breaths, like I can't get enough air. This still happens to me from time to time, especially in tight spaces. At a little over 11 by 7 feet, this cell is smaller than any I've ever inhabited. You can't pace in it.