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

I'm German, after all.

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

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

I love when I'm trying to do something I don't know how to do, and it kind of figures itself out along the way. And that means messing up a lot. That means throwing away a lot of drawings.

We had a dog, Lucky, who was fourteen years old. For the last year of his life, I would take him on these walks that were long but didn't cover much distance.

Often they do go back and forth the whole way, and I don't know until the very end what the last line of the book is going to be. That was true here - the very last line of the book was the last thing that happened.