One by Kathryn Otoshi - This book is simple and profound at the same time. Through colors and numbers, it introduces young readers to the concepts of diversity, embracing one’s unique self and the strength in unity. 

By making colors her characters and giving them feelings, Kathryn conveys serious topics of peer pressure and bullying with whimsy that captivates young readers attention. My five-year-old daughter loves this book. But even my two-year-old son is attracted to the colors and will sit down long enough for me to read this book to him. More about the book here.