A fractal is a complex geometric figure made up of patterns that repeat themselves at smaller and smaller, or larger and larger, scales. In nature, they're found in fern leafs and corals. In this book, they're found in the pattern for a scarf, the cables of a pullover, and the intricate hemline of a skirt. The pentagon is a familiar five-sided figure that, in nature, can be spotted in the starfish or sand dollar; in this book it's spotted in the yoke of a pullover, the textures of a cardigan, and the shape of a shawl. In nature, water waves and chemical waves abound; in this book, they flow as the patterns in a hat and mittens and in the gores of a skirt.