Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The Greatest

As another reviewer noted, it is too bad that the complete works of this great man are not fully available. I discovered him quite by accident in an "annual" of short stories. "A Planet Called Shayol" was the only science fiction story I've ever read that brought tears to my eyes; I had to close the book for a while. That doesn't often happen when reading any book, much less science fiction work.I stongly recommend "Quest of the Three Worlds"; unbelievable that someone could imagine that universe and then write about it so well.That said, Norstrilia is a rolicking good time book with rich underlying stories-within-stories. Fun, but deep stuff.