Let's put it this way: if you are a novelist, I think you start out with a 20 word idea, and you work at it and you wind up with a 200,000 word novel. We, picture-book people, or at least I, start out with 200,000 words and I reduce it to 20.
You know, now it's sinking in. It's taken me a long time to realize - and it is sinking in - how important this book is. And I have a certain distance now. I've done it such a long time ago.
One day I think it's the greatest idea ever that I'm working on. The next day I think it's the worst that I've ever worked on - and I swing between that a lot. Some days I'm very happy with what I'm doing, and the next day I am desperate - it's not working out!
That's something I learned in art school. I studied graphic design in Germany, and my professor emphasized the responsibility that designers and illustrators have towards the people they create things for.
The hardest part is developing the idea, and that can take years.
They are deceptively simple. I admit that. But for me, all my life I try to simplify things. As a child in school, things were very hard for me to understand often, and I developed a knack, I think. I developed a process to simplify things so I would understand them.