As it turns out, you don't have to fill pages of mermaids and fairies in order to get the therapeutic benefits of coloring as an adult. To prove it we set out to create some of the coolest coloring books in history featuring the worlds most iconic and rare automobiles, motorcycles, and other grown-up toys for enthusiasts from all walks of life. In "American Muscle" we explore an era in US car culture that sparked the original horsepower race with some of the most iconic, rare, and powerful vehicles ever produced on American soil. These intricate. colorless, interactive depictions of highly sought after US made automobiles were painstakingly developed over many weeks and hand selected for this particular book. We invite you to join us in this "name that car" format adventure as we discover the secrets behind these high quality drawings.