It’s a simple concept book, suitable for even the youngest students, yet it doesn’t over-simplify the concepts. Each two-page spread includes four images of shapes opposite the title question. But the first set of four shapes adds the question, “why?” and goes on to explain how each of the four shapes could be the correct answer for different reasons. The important part isn’t which shape the reader chooses; the important part is in discussing why. A letter from the author in the back of the book reminds the reader that what words they choose to describe their thoughts aren’t what’s important either — as long as they are considering they different traits of the shapes, they are thinking mathematically. A great book for divergent thinking.