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"But the problem with reincarnation is that it's hard to imagine what the storage medium for past lives would be. Not to mention the input-output device. I hesitate to rule it out completely, but I'd need pretty definite proof."
- Arthur C. Clarke

Interactive Blackboard  
  Early description of an interactive display device for lectures and demonstrations.  

Managing Director Jason Dill, Coordinating Director of the Unity system, is the highest ranking human in the world. He takes orders directly from Vulcan 3, the underground supercomputer that directs all human endeavor.

When asked a question by schoolchildren, however, he steps up to the interactive blackboard.

Director Dill was unshaken. He stopped in front of the blackboard. Experimentally, he raised his hand and moved it in a figure. White lines traced themselves on the dark surface. He made a few thoughtful motions and the date 1992 traced itself.

"The end of the war," he said.

From Vulcan's Hammer, by Philip K. Dick.
Published by Ace Books in 1960
Additional resources -

This is a very early description of an interactive display that is acted upon solely by gestures.

You can see a good representation of this idea a generation later in wired glove interface display from Spielberg's Minority Report (Movie).

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Additional resources:
  More Ideas and Technology from Vulcan's Hammer
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to Vulcan's Hammer
  Tech news articles related to works by Philip K. Dick

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