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"All fiction is propaganda, and the fiction we like is the propaganda we believe in, and the fiction we don't like is the propaganda we don't believe in."
- Samuel R. Delany

Helium Tubes  
  Lighting that exactly mimics the frequencies of sunlight.  

I thought the passage flooded with daylight; but now I saw that that light rose from behind a narrow cornice and was reflected from the white tiles of the ceiling to those of the floor.

"Helium tubes," he said. "Exactly the same quality and intensity as sunshine."

Technovelgy from The Cubic City, by Louis Tucker, D.D..
Published by Science Wonder Stories in 1929
Additional resources -

This kind of lighting is essential in a vast cubic building because there can be so few windows compared with the total interior space.

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Additional resources:
  More Ideas and Technology from The Cubic City
  More Ideas and Technology by Louis Tucker, D.D.
  Tech news articles related to The Cubic City
  Tech news articles related to works by Louis Tucker, D.D.

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