From the beloved New York Times bestselling author of I Wish You More, Amy Krouse Rosenthal, a delightful book of fanciful equations.Whether it's "wishes + frosting = birthday" or "birds + buds = spring," each equation is a small delight. This Plus That proves that life's total experience is always greater than the sum of its parts.This book can be used to introduce equations or even some basic life lessons. Its warm and amusing tone invites readers to come up with their own life equations, and it makes a creative gift.