I was glad to find out that Ezra Jack Keats had written and illustrated more stories about Peter, the little boy who goes out in the snow in his The Snowy Day. Whistle for Willie finds Peter in the heat of summer, trying to whistle so he can call his dog. Both the simple story and the glorious paper-collage artwork exude warmth and delight in simple childhood pleasures. I loved the picture showing Peter's mom and dad proud of his new skill, whistling. My kids (and I, let's be honest) enjoyed it very much. And do check out the other 'Peter' stories, A Letter To Amy and Peter's Chair.