Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Excellent book

Ley Lines are well explained in this book, which provokes connecting thoughts towards other applications. The author is thorough in explaining the background, illustrations, descriptions, and detection of ley lines. I found the discourse regarding "cup marks" on stones fascinating, and the implications of magnetic energy escaping from fault line areas very interesting. I recommend this book for anyone interested in magnetic energies and/or ley lines discussion.