I don't know what I like more about this book: the concept or the structure (pun intended). Iggy loves to build out of anything he can get his hands on, including dirty diapers. But when he reaches second grade his teacher says NO! That is until Iggy’s architecture brilliance helps save the class from a doomed school trip. I love to see more science concepts building in these types of books. Plus what makes this stand out compared to other STEM books done by authors is the magnificent rhyming structure. It does not feel forced or slow. Just wonderful.