This film is a rare and wonderful gem that stays with you for days after viewing. Visually, it resembles a series of beautiful watercolors, with the animation having an almost a stop-motion quality to it. Though the story is told (nearly) without words, it's accompanied by a moving score and the familiar sounds of children's laughter and crying.
The titular hero--a steadfast little pig--is adorable and sweet-natured. His daily torment and isolation at school are heartbreaking to watch. He's clearly deprived of the love and appreciation he deserves, and you wish you could reach through the screen to comfort and protect him. Be warned--as beautiful as this film is, it's also bound to evoke some of your ugliest childhood memories, whether you ever were on the giving or receiving end of bullying, or simply stayed silent on the sidelines as it happened.
Growing up, many of us built our own "dams" to cope with the darkness of teasing, bullying, and loneliness. When the dams broke, having someone there on the other side--a friend, parent, teacher, anyone--could make all the difference. To me, this is the core message of the film. If you have young children that are just starting school, consider watching and discussing with them.