Book 1: Spikeballs Book 2: Meatballs Book 3: Bouncyballs Book 4: Timeballs
He turned 8. Book inspired by the movies Dodgeball and Spacejam.
Here is a video of the design process
Book 1: Spikeballs Book 2: Meatballs Book 3: Bouncyballs Book 4: Timeballs