What are you unwilling to optimise?

We also believe in straight-talking, telling it as it is, using simple language that people understand, telling people about the downsides as well as the potential upsides, and even telling the bad news that no one wants to utter, like our lack of belief in the sustainability of the Icelandic financial sector that already we had months before the collapse hit us.

The way I work is — I want to not have external stimulation. You can kind of see, on the walls are this light green. I'm told that at mental institutions they use that on the walls. It's like a calming color, it's not something that really stimulates you. What you can't see is the computer here, you only see the screen, but the main thing I worry about in my computer is — it doesn't have to be big and powerful, although I like that — it really has to be completely silent. I know people who work for Google and they have their own small data center at home, and I don't do that. My office is the most boring office you'll ever see. And I sit there alone in the quiet. If the cat comes up, it sits in my lap. And I want to hear the cat purring, not the sound of the fans in the computer.

Any lasting relationship needs non-negotiables. We made the decision early on never to be apart for longer than two weeks: 26 years married and we’ve only broken that rule once, by 11 hours, when my wife was in Sleepy Hollow. If I ever meet [director] Tim Burton, I’ll be having words.