9From high up in a tree, to inside a shoe and outside of a mouse hole, Leo Lionni's signature illustration style and a toddler-friendly text ask a simple question: Where is the mouse on each page? One of four board books that celebrates the art and imagination of Leo Lionni, this book is a perfect introduction to an early learning concept for busy toddlers, as well as a wonderful stepping stone into the world of one of our best-loved children's book creators.