The exploration continues, but this time the path becomes more challenging. In The Explorer's Guide to Shields, readers will learn their 2D shapes through the shield collection of our second introduced character, Krin. Although the repeated format continues throughout the Explorer's Guide series, this book introduces a shift to a repeated two sentence format. This, along with a predictable progression of shapes, helps to provide readers with a comfortable space in which to take academic risks and continue their growth as readers. From circles to decagons, explorers will master this fundamental vocabulary.