Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Thought and emotion provoking story.

This book makes you think about life, death, other forms of reality, and mankind in general. The frightfulness of Hal (The artificialy intelligent computer who turns into one of the books great mysteries) generated much fear in my mind. I've never been fearful of a computer in a book before and I don't think I ever will again. A great book to make you think about how we got here and why.