Some of it just involved thinking about, for example, the different kinds of science, what chemistry is.

One of my favorite moments in that book [As Easy as Falling Off the Face of the Earth] was when something happened that I had no idea was going to happen.

I don't think about it that much, but sometimes I am surprised by that. I sometimes wonder why I didn't turn out to be the kind of picture-book writer who has stuffed animals that go with their books. That would be okay with me.

Ideas mostly come from the work itself. Often when I'm drawing, the words will be bouncing around in my head, and when I'm writing, ideas about the drawing happen.

I generally have an idea where I want to go, but I don't know how I'm going to get there.

I do love that discovery of when you're trying to figure out how to make something work, and it happens in a way that you didn't predict.

By the time I finished the book [All Alone in the Universe], Robin Roy was saying, "More pictures!"