Well the truth is, everybody, when they die, leaves a void that cannot be filled.

Working with the editor on the set means that it is possible to keep track, at every moment, of the exact temperature of the trajectory of the scene - and know precisely what is required to continue, or precede, the action already shot. Like building a giant jigsaw puzzle. This is a freeing procedure because one is divested of all the options that might otherwise hamper one's choices. Clarity is possible. And that means one can relax into each shot, knowing the clear boundaries of where it might end or begin. And with relaxation, comes play.

I've been really happy to be in that conversation with Scott [Derrickson] for a few months now. We started chewing this cud a while ago. He is, as you probably know, an extremely erudite thinker in terms of religious philosophy and just thinking about a modern take on something really, really ancient, about how to imagine living beyond any physical bounds, which we're on the verge of now.

We [ with Ewan McGregor] decided exactly what we would do at every moment, what the texture would be.

This film [Doctor Strange] kind of takes that everyday boring reality and really bursts it wide. So we talked a lot about that. In many ways there's something very practical about this world, the Kamar-Taj. It's - You know, we all look like samurai warriors, but actually there are iPads everywhere and there's a feeling that it's a practical possibility for this modern world that the Doctor Strange universe is functioning, and that we know it and it's around the corner for all of us.

One of the wonderful things that I've always loved as an art student, what I always loved about comics, was that they are interpreted differently by different graphic artists all the time, so now film is doing that thanks to Marvel Studios.

I'm really interested in the idea of long, long life and transformation and immortality.