Instruct: Classify a given Amazon review as either positive or negative.
Query: exciting, imaginative!

I finished this book during a 13-hour flight from Chicaga to Tokyo. Frankly, this book didn't impress me very much at the beginning, but halfway through, I was hooked! The first part is a little boring, but from second part, it slowly builds up tension, and reaches climax and I was very impressed by Mr.Crichton's thorough knowledge of zoology and astronomy, and the descriptions of the fictional spaceship is plausible and imaginative.Unlike many others, I like the ending of the book. I think this book would have been a mediocre sci-fi novel if Mr.Crichton had conceived some alien creature in the sphere.