Richard Hamming

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 ten years later somehow, you don't quite know what problems are worth working on.

When I have a creative insight, there is a high. I think back in the day, I made music as much as I did because it made me feel so good. I think you could argue that there is a creative addiction - but, you know, the healthy kind.