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"I received a nice letter the other day from the Dalai Lama. He had read 'The Nine Billion Names of God'. It is about a computer at a Tibetan monastery."
- Arthur C. Clarke

Polarized Window  
  Rather than curtains, use the window to control the light.  

The sun came up; golden light washed in like a tide across the vast reaches of the world-city...

Farr polarized the window and light died from the room. He set the wall clock to call him at noon, sank into bed, and fell asleep.

The window depolarized, and daylight entered the room.

From The Houses of Iszm, by Jack Vance.
Published by Better Publications in 1954
Additional resources -

Compare to the Polawindow fromThe Godmakers (1972) by Frank Herbert.

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Additional resources:
  More Ideas and Technology from The Houses of Iszm
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