I love this book! The text is simple and poetical. A single sentence per two-page spread uses a repeated structure to express some big, complex, sometimes intangible ideas. The real star of this book are the illustrations: for every big idea there are many individual illustrations, offering different ways those words could be interpreted. They invite the reader into really pondering those big ideas. The use of color is very deliberate and effective. I listed this book as intended for elementary, but I certainly think it would have uses and appeal for all ages.