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"did I had an extremely expensive wife - she would see a new car that she liked and just buy it... under California law I was bound to buy her debts. I think I turned out 16 novels in five years."
- Philip K. Dick

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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