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"In science fiction one can say a great many things that are unpalatable, because it's expressed as science fiction you can slip it past their defenses."
- Frederik Pohl

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.
From God Emperor of Dune, by Frank Herbert.
Published by Putnam in 1981
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