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"If you have a gut response to a story, you are not responding to something new ..you are really responding to a story you were told when you were six or seven…"
- Samuel R. Delany

Black square  
  A device for secret communication.  

On Anteac's lap lay a small square of inky black about 10 mm on a side and no more than 3 mm thick. She wrote upon the square with a glittering needle, one word upon another, all of them absorbed into the Square. The completed message would be impressed upon the nerve receptors of an acolyte messengers eyes, latent there until they could be replayed at the Chapter House.
Technovelgy from God Emperor of Dune, by Frank Herbert.
Published by Putnam in 1981
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  More Ideas and Technology from God Emperor of Dune
  More Ideas and Technology by Frank Herbert
  Tech news articles related to God Emperor of Dune
  Tech news articles related to works by Frank Herbert

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