This is my favorite nonfiction book I used or had available during our first focus on sorting. The book is part of the series Math Counts and is published by Children's Press. The book has photographed objects to illustrate each page and to guide the reader while learning about sorting. I think this book is able to reach all levels found within a primary classroom. The book begins with a collection of small objects and the following four pages each show one of the objects collected as a group, identical objects. A fairly easy sort for kindergarten students. As the book progresses, connections are made for the reader when they think about their own houses. For example, one sort is the objects found in a bathroom. Another page focuses on shoes, socks, sneakers and boots. All things worn on your feet. To extend our student's vocabulary this book did a great job defining the word set, "when like things are sorted together." The book later reinforces, "things that make up a set have somthing in common." My students found the photographs of real objects interesting and I thought they provided a higher level of engagement and interaction with the book. It's also a great model or springboard for sorting activities within the classroom.