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"...in fifty years, do you believe that people will be recognizably human?"
- Greg Bear

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.


(Solido Projector from 'Dune' by Frank Herbert)

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.

Technovelgy 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.

Here's a larger image of the projection itself:


(Factory Crawler from 'Dune' by Frank Herbert)

Compare to the solidograph from Gather, Darkness! (1943) by Fritz Leiber.

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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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