For many years, I wanted a better shapes book to read with my own children, and for parents and teachers to have in their homes and classrooms. This is that book.

Which One Doesn't Belong? is based on a simple premise—a single question—yet provides important opportunities for noticing and talking about a wide variety of properties of shapes.

If you've ever wondered why other shapes books never put a square on the rectangle page, Which One Doesn't Belong? is the shapes book for you!