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"The primary attraction [of writing sf] is the sheer pleasure of creating something from whole cloth."
- Dan Simmons

Fusion Sunlight Tube  
  Central light source for a spun cylinder space station.  

Five miles overhead was the fusion sunlight tube, running down the radius of the slightly bulging cylinder that was Farmer's Asteroid. Five miles above the sunlight tube, the sky was a patchwork of small squares, split by a central wedding ring of lake and by tributary rivers...
From At the Bottom of a Hole, by Larry Niven.
Published by Galaxy Magazine in 1966
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