Instruct: Classify a given review into positive or negative sentiment.
Query: a must buy book on photography

if you have a serious interest on photography, this book is a must buy. It keep pushing you on considering the meaning of taking a pic, the relationship between the real world and photography, and many other perspectives related to photography. It provide large amount of examples to support its views. I truly think this book is a bible for every photographer. Even if we enter the digital era of photography, the content of this book isn't out of date and have precious value.Regard to the fact that there is no picture in the whole book, I think that is a right choice. Any presented pictures will limit the universality of discussion, rather than realize it.Overall, I give five star for this remarkable, historic book.