A Letter To Amy by Ezra Jack Keats
I will always have a special place in my heart for all things Ezra Jack Keats makes. He's the king of picture book collage - and this book follows our beloved Peter (from A Snowy Day, Peter's Chair, Whistle for Willie...) as he grapples with wanting to invite a girl - Amy - to his birthday party. He decides that he should mail her an invitation so that it's 'more special". As our neighbours south of the border need us to support their Post Service now more than ever, I can't think of a better book that shows how special a mailed letter truly is.