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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
- Neal Stephenson

Black Cube Teaching Machine  
  A device that offers recorded images, teaching the user.  

An enjoyable vision of the future from Williamson, this time a presentiment of the hologram.

I tore my eyes from the weird, burning wonder of Allurova, to look at the black cube.

It was flushed with gray. A faint mist of silver-gray was born in it, and filled it, and became brighter, until it was a cube of silver flame.

A bell note pealed from the instrument, clear, deeply golden. Its liquid reverberations trembled and shattered into silence. And the silver light ran out of the cube like molten metal.

It left the figure of a man. The cube was invisible ; the figure seemed to stand before us, on a little argent table. It was only two feet high; only, I knew, an image. But no reality could have been more vividly real.

It was an old man, robed strangely and in white, with the grave stamp of an austere power upon his solemn face.

He gestured for attention, with a manner of serene authority. His lips moved. He spoke. His voice rang clear in the darkened chamber — though I knew it came across forty million miles of space and forty thousand years of time.

Don touched another lever. The voice stopped. The molten silver rose again, filled the cube, faded to blackness. The humming ceased. Don — to my relief — snapped on the lights.

“You see, now, Red, how I know.”

“You could — understand?”

“It’s something like our talking pictures,” he swiftly explained. “There are dozens of records. The first were picture lessons in the Martian language. The speaker pointed out objects, and named them, and illustrated the meaning of verbs. Then there were lectures on the history and the art and the science of Mars. The thing’s tremendous, Red! Three months, I’ve been working on it, twenty hours a day. And I haven’t even begun.

From The Flame From Mars, by Jack Williamson.
Published by Astounding Stories in 1934
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