Vin Diesel

Every actor has their own process. For me, I really need to stay in the pocket. So, if I'm on set and I'm in character, I'm not thinking like a producer. If I'm on set and I'm not in character, wardrobe and make-up, and I'm just coming on set for the moments that I'm not shooting, then I'm able to be the producer.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.