The Rainbow in My Heart#1 Bestselling title 'Would I use the book to support tamariki (children) better understanding emotions? Yes, I definitely would.' Mental Health Foundation of New Zealand 'An excellent book for parents and ECECs' Maggie Dent, parenting author and educator. We all have lots of feelings, it's OK to let them show. They all live in our heart as our very own rainbow. What does your body do when you're sad or angry? How do you show someone you are proud?