Gray Matters is a science fiction novel by William Hjortsberg.

[1] World War III has devastated most of the world, but life is still good for the lucky (and rich) few hundred persons who had their brains preserved in an automated conservatory.

Although they have no bodies to move around with, they are free to mentally visit any of the other residents, and engage in all the emotional, intellectual and (pseudo-) sexual congress that they desire.

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