How big is love?

In this charming, whimsical book, a grandmother and her grandson try to describe how big the love is between them. Is it as much as one big hug? No, Matthew wants more. Is love as big as five giraffes riding in a car? Or six monkeys hanging on a star? Or can love be as big as forty-nine frogs swinging on a clock? Or maybe fifty-five hippos jumping over a rock? In the end, their love proves to be immeasurable, bigger than the whole world.