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"I share the view of Pythagoras that the world is number. The ultimate substrate of the universe is math. There's no way to test that - it's pure metaphysical speculation."
- Bart Kosko

Sceneshifter  
  An automated display device that produced random pictorial presentations.  

The place was cool and dark. A few men and women were at the bar; the rest sat around tables. Some youths were playing throw in the back. A mechanical tune-maker wheezed and composed in the corner, a shabby, half-ruined machine only partially functioning. Behind the bar a primitive sceneshifter created and destroyed vague phantasmagoria: seascapes, mountain peaks, snowy valleys, great rolling hills, a nude woman that lingered and then dissolved into one vast breast. Dim, uncertain processions that no one noticed or looked at....
From Last of the Masters, by Philip K. Dick.
Published by Orbit Science Fiction in 1954
Additional resources -

Compare to the moving picture player from When the Sleeper Wakes by HG Wells, and the life chamber from The Chamber of Life, by G. Peyton Wertenbaker.

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Additional resources:
  More Ideas and Technology from Last of the Masters
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to Last of the Masters
  Tech news articles related to works by Philip K. Dick

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