How Big Is A Giant's Head

"How big is a giant's head?" inquired Shea's five year old. That set off a whole bunch of exploration in to what some of the advantages (and maybe disadvantages) of having a giant for a friend might be.
As the book unfolds, we find the giant to be a most likeable guy and after all the considerations, the reader concludes that it isn't always the way a person appears that makes for a good friend...but how kind the person is and what's in their heart.