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"We each live in a somewhat unique world of our own psychological content."
- Philip K. Dick

Keyboard With Changing Keys  
  A computer keyboard with keys faced with little displays, so the label could change based on the application or language.  

There were fifty neat little studs; each, however, had an unlimited number of functions, according to the mode of operation - for the character visible on each stud changed according to the mode.
From Imperial Earth, by Arthur C. Clarke.
Published by Harcourt Brace in 1976
Additional resources -

One of the features on Clarke's Minisec.

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  More Ideas and Technology from Imperial Earth
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