Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very Essential.

I took a watercolor college class and my teacher had this. I loved it so much I bought one for myself. It is a great collection of medias, tools and tips. It inspired me to use different techniques in my art, such as negative painting. I have a couple other books on watercolor but this is the one I always refer back to.I would suggest this book to anyone who paints with watercolors, amateur and professional alike.