From "The joys of having a Forever Project":
..a project that, despite its audacity and seeming impossibility, simply will not put itself to bed. A project that comes creeping back into your consciousness when you sit down for a break from “real work.” A project that is hard to imagine actually embarking on, but whose mental cost of abandonment is far too high to even consider. A project that you'd totally do if you had the time, and the money, and the talent, and the…I think I might have one. Except I've never worked on it. Maybe I should start.