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"Science fiction operates a little bit like science itself, in principle. You've got thousands of people exploring ideas, putting forth their own hypotheses. Most of them are dead wrong; a few stand the test of time; everything looks kind of quaint in hind"
- Peter Watts

Solido Projector  
  Projects 3-dimensional images.  

This device is used several times in Dune; in the quote given below, the Duke Atreides and his staff are in conference after taking the fief of Dune:

A solido tri-D projection appeared on the table surface about a third of the way down from the Duke. Some of the men farther along the table stood up to get a better look at it. Paul leaned forward, staring at the machine. Scaled against the tiny projected human figures around it, the [factory crawler] ... was basically a long, buglike body moving on independent sets of wide tracks.
From Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

The glossary of terms at the back of the novel states that a solido is a three dimensional image using the 360 degree image imprinted on a shigawire reel, adding that "Ixian solido projectors are commonly considered the best" - essential information for those of you shopping today on Ebay.

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Additional resources:
  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
  Tech news articles related to Dune
  Tech news articles related to works by Frank Herbert

Solido Projector-related news articles:
  - Heliodisplay M2i - Interactive Midair Touchscreen

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