Triangle by Mac Barnett and Jon Klassen has a cover like an oversized board book and paper pages like a picture book. As you can see by the cover, there are no words, not even the title. Klassen’s distinctive style is apparent, and you can always look on the spine for the title, publisher, author, etc. It’s a book made for little thinkers because it poses questions.
Everything in Triangle’s life is triangular and everything in Square’s life is square. To get to each other’s house, they need to go past a bunch of other shapes, some of which have no name. And Triangle plays a sneaky trick on Square and Square retaliates. That’s the book. And it’s great.