This book is a good reference to the art of tying knots. I have been working on knots the past few weeks. I am and have been curious about the origin of these useful tools and techniques for a while. These works of art are a joy to tye and frustrating at the same time, as are the hobbies of most people. I will be purchasing a few more books to further my knowledge of this art. Thanks to the Author of this fine book.