I have a library room with four desks in it. On one of them is a spec, on one of them is a present work, on one of them is reading for a future work, on another desk is a novel I'm not doing until I'm a hundred and fifty, and things like that. But, contractually speaking, you just do one at a time when it's on and paid and live. You do your real day on one project and the rest is just literary life. Or intrusions.