I don't like things to be static when I'm working.

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 knew what infinity was. Being a previous art student, I knew about some art concepts.

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 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.

A long time ago, I had an idea to make a book for preschoolers who had older siblings who were going to school.

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