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"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
- Larry Niven

Wall-Light  
  The walls of a room provide illumination.  

Ducem Barr stepped aside and in the interior of the house the walls glowed into life. The general entered into the daylight.

He touched the wall of the study, then stared at his fingertips. "You have this on Siwenna?"

From Foundation and Empire, by Isaac Asimov.
Published by Doubleday in 1952
Additional resources -

The wall-lights can also change color:

He leaned far back into the soft cushions of his chair. The wall-lights had softened to a pink-ivory glow, which mellowed even the soldier's hard profile.

Compare to illuminum from Richard Morgan's 2003 novel Altered Carbon.

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Additional resources:
  More Ideas and Technology from Foundation and Empire
  More Ideas and Technology by Isaac Asimov
  Tech news articles related to Foundation and Empire
  Tech news articles related to works by Isaac Asimov

Wall-Light-related news articles:
  - Machine Prints Lights In Sheets
  - Nth Lights From NthDegree Are 'Printed Lights'
  - Lightpaper Way Thinner Than OLED

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