One of the Winnie the Pooh , Just Be Nice series. In this wonderful book, Piglet wants to play with the others, but each tells him he can't for various reasons... he can't bounce, he is too small, he is not strong enough. Finally, Piglet makes up his own game. Now the others want to join him. At first Piglet tell them "No, this castle is only big enough for me." Then, he sees how sad they are and invites them to build a bigger castle with him to make room for all to play. The story teaches others how to grow from mistakes and how to encourage friendship.