I think Laurie's Keller story 'We are growing', resonates because when you have that amount of independence, you're starting to ask yourself questions that the grownups in your life have been answering for you. Before that, you are a good kid, or you are a funny kid, because you're told that's who you are. But when it's just you and the book, you have to figure out who you are.

I've been lucky enough to have made enough of these types of children's books that while I don't necessarily know what works, I know what doesn't work. I've got a sense of the rhythm and the form. With this series, I get to play with ideas that I would never have myself.

Elephant and Piggie could just Google themselves! With the Elephant & Piggie Like Reading! series, we're picking artists who have a voice already. They have a sensibility. I don't want to make a book about blades of grass. That doesn't interest me. I want to make a book that Laurie Keller uses to express herself in this format. That's the key. That's what's going to keep it individual.

A book, being a physical object, engenders a certain respect that zipping electrons cannot. Because you cannot turn a book off, because you have to hold it in your hands, because a book sits there, waiting for you, whether you think you want it or not, because of all these things, a book is a friend. It’s not just the content, but the physical being of a book that is there for you always and unconditionally.

Writing for children is as easy as describing the history of the Byzantium in three words.

I also learn a lot about everybody else's process. People create in different ways, so that has opened me up to different processes and experimenting. Laurie Keller is a character person, so she came to the project with these blades-of-grass characters that we were able to literally grow a story around.

If you ever find yourself in the wrong story, leave.