I find myself introducing books to my kiddos by saying "this is one of my all-time favorites" a lot! But this one really is. I remember being in a class during my teacher certification and having the professor read us this book. It's a story about a child writing to what I assume is her former teacher asking questions about the whale in her pond. She names him Arthur and doesn't seem to believe his claims that whales do not live in ponds.
I am introducing my students to the concept of multiple perspectives and I asked them what this imaginary whale would say to the main character Emily. I loved their responses-especially the illustrations: