and can I just say that I love, love, love this book!
In spring, when City Dog runs free in the country for the first time, he spots Country Frog sitting on a rock, waiting for a friend. "You'll do," Frog says, and together they play Country Frog games. In summer, they meet again and play City Dog games. Through the seasons, whenever City Dog visits the country he runs straight for Country Frog's rock. In winter, things change for City Dog and Country Frog. Come spring, friendship blooms again, a little different this time. Mo Willems' spare, poignant text and Jon J Muth's expressive watercolors team up to present a reflection on the natural course of friendship--and life--that will resonate with readers of all ages. (review from here)
By Mo Willems - Hyperion Books for Children (2010) - Hardback - 64 pages - ISBN 1423103009
The illustrations are amazing and the text, while simple, is poignant and speaks volums and lends itself well to discussions of friendship with any age.