Sphere is a 1987 novel by Michael Crichton, his sixth novel under his own name and his sixteenth overall.

The story follows Norman Johnson, a psychologist engaged by the United States Navy, who joins a team of scientists assembled to examine a spacecraft of unknown origin discovered on the bottom of the Pacific Ocean. The novel begins as a science fiction story but quickly transforms into a psychological thriller, developing into an exploration of the nature of the human imagination.

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See also:

- [Sphere](https://openlibrary.org/works/OL18169959W/Sphere)

Also contained in:

- [Congo / Sphere / Eaters of the Dead][2]

[1]: http://www.michaelcrichton.com/sphere/

[2]: https://openlibrary.org/works/OL14950504W/Congo_Sphere_Eaters_of_the_Dead