Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Imperfect Classic

This book is definitely one of the classic books on fly fishing and fly tying from the second half of the 20th century. It helped to fracture fly fishing's single minded obsession with may flies and move intelligent fishermen toward a more complete understanding of the trout's complete food menu. The author's emerging pupae imitations became a milestone for new caddis patterns. However, the book lacked meaningful photograhic evidence of the accuracy of the author's patterns. More recent advancements by the likes of Craig Mathews have taken Caddis imitations a full notch further.