Meet two friends who think they're building imaginative worlds with blocks but come to realize they've been building something far greater--a sturdy, solid friendship--in this picturebook by award-winning creators.

Two kids build entire worlds out of blocks, cardboard, and imagination. From boats attacked by a sea creature to a castle crumbling into the ocean. And they don’t mind when these creations break apart and CRASH to the floor. In fact, they think it’s pretty funny! Every time, a creation falls apart, they pick up the pieces and keep building bigger and better.