My strips are not always funny, and they can be pretty grim at times, and I know I lose readers because of it, but I can't do anything about it - my work is very much connected to something I need to do in order to feel stable.
When I work on a book, I usually start with a question. And I don't sit around and go 'I need to write a book. What's a good question?' It will be a question that's just clanging around in my head. So for 'What It Is,' it was this idea of 'What is an image?'