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" I sometimes suspect that we're seeing something in the Internet as significant as the birth of cities. It's really something new, it's a new kind of civilization."
- William Gibson

Screensaver (Inventor of)  
  Screen savers are used to prevent phosphor burnout in CRTs, and to provide restful entertainment on computer screens.  

As far as I know, this is the first reference to what later became known as "screensavers." The current implementation of the aquarium screensaver is pretty good, but only in two dimensions.

They went to the living room; Jill sat at his feet and they applied themselves to martinis. Opposite his chair was a stereovision tank disguised as an aquarium; he switched it on, guppies and tetras gave way to the face of the well-known winchell Augustus Greaves.
From Stranger in a Strange Land, by Robert Heinlein.
Published by Putnam in 1961
Additional resources -

For those who have already forgotten, "screen savers" received their name because they were used on computers that used cathode ray tubes as output devices. A CRT uses an electron gun to shoot particles at the phosphor on the back of the screen, causing tiny points of light to appear; constantly varying the images prevents the screen phosphor from being permanently marked if the electron gun points at the same point of the screen.

Today, of course, screen saver is a term for something entertaining to put on your computer screen while you are not doing anything with it.

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Additional resources:
  More Ideas and Technology from Stranger in a Strange Land
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Stranger in a Strange Land
  Tech news articles related to works by Robert Heinlein

Screensaver (Inventor of)-related news articles:
  - Electric Sheep Distributed Screen-Saver: Collective Computer Unconsious

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