I notice that if you have the door to your office closed, you get more work done today and tomorrow, and you are more productive than most. But 10 years later somehow you don't know quite know what problems are worth working on; all the hard work you do is sort of tangential in importance. He who works with the door open gets all kinds of interruptions, but he also occasionally gets clues as to what the world is and what might be important.

I don’t think of it as research. I read for interest and enjoyment, and when I cease to enjoy it I stop. I didn’t research quantum mechanics but I was fascinated by the mystery that lies in the foundation of the observable world, of which the most familiar example is the wave/particle duality of light. I thought it was a good metaphor for human personality. The language of espionage lends itself to this duality—think of the double agent.

When you’re a carpenter making a beautiful chest of drawers, you’re not going to use a piece of plywood on the back, even though it faces the wall and nobody will ever see it. You’ll know it’s there, so you’re going to use a beautiful piece of wood on the back. For you to sleep well at night, the aesthetic, the quality, has to be carried all the way through.

I still regard adventure pretty much as a hobby to tell you the honest truth, and I think this approach to it keeps one refreshed almost. I think if you just regard adventure as a business, working becomes very boring as many other businesses can become. But even though adventure changed my life considerably, both in what I was doing and even economically, I’ve always regarded myself in a sense as a competent amateur.

My mother said — and I didn’t realize how well it works — when I’d bring a drawing to her, she said, “I don’t look at the drawing. I looked at the child, and if the child was excited, I got excited.” And then we could discuss it. Because we were bringing something that meant something to me as a child. And so she would join in my lassitude, or my excitement, or my frustration. She wasn’t a psychologist, but she did understand this simple matter. Also, it accomplishes the only thing that has any meaning to a little child. The only thing an adult can give a child is time. That’s all, there isn’t anything else. That’s the only thing they need, really, is time. If you give them time, you’ll have to be understanding of them and give them time.