Note that the book credits Illustrations by John Kascht "‘For the book's illustrations, Watterson and caricaturist John Kascht worked together for several year

Note that the book credits Illustrations by John Kascht "‘For the book's illustrations, Watterson and caricaturist John Kascht worked together for several years in unusually close collaboration. Both artists abandoned their past ways of working, inventing images together that neither could anticipate—a mysterious process in its own right.’"