The Book One written by Kathryn Otoshi and illustrated by Kathryn Otoshi is a book for ages 6 – 9 years old. It is a book that mostly focuses on being positive and being one, the book is about these five colours which are Red, Blue, Purple, Yellow, and Green. Red is a hothead and likes to Boss the colours around, then One came along and he brought all the colours together to become one and to get along with each other. Overall, I would rate this book a 3 out of 5 because there were some good details but I didn’t find it to be that interesting.