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"I think crypto will slowly percolate its way up and people will adopt it gradually as user friendly, cheap products, become available."
- Neal Stephenson

Iridium Spirals (Street Lights)  
  Streetlights provide sunlight at night.  

The party proceeded to roll down Broadway, the historic thoroughfare of New York. Despite the fact that it was 11 o'clock at night, the streets were almost as light as at noonday. They were illuminated brilliantly by the iridium spirals, hanging high above the crossings. These spirals gave forth a pure, dazzling-white light of the same quality as sunlight. This light was absolutely cold, as all electrical energy was transformed into light, none being lost in heat.
From Ralph 124c 41 +, by Hugo Gernsback.
Published by Modern Electrics in 1911
Additional resources -

Compare to light sculpture from Light Verse (1973) by Isaac Asimov, concentrated light from The Shining One (1937) by Nat Schachner, and wall-light from Foundation and Empire (1952) by Isaac Asimov.

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Additional resources:
  More Ideas and Technology from Ralph 124c 41 +
  More Ideas and Technology by Hugo Gernsback
  Tech news articles related to Ralph 124c 41 +
  Tech news articles related to works by Hugo Gernsback

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