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"Self-education is, I firmly believe, the only kind of education there is."
- Isaac Asimov

Holo-Cube  
  A very large holographic display, that a person could walk into.  

He rotated the enlarger. All the other cubes cut out; one huge cube formed from the previous eight. Standing, Fred walked into the holo-cube, into the three-dimensional projection, and stood close to the bed to scrutinize the girl's face...

He emerged from the holo-cube collapsed it, and restored the eight small ones.

From A Scanner Darkly, by Philip K. Dick.
Published by Not Known in 1977
Additional resources -

Compare to the stereo tank from Robert Heinlein's Stranger in a Strange Land (1961) and the 3D tank from EE 'Doc' Smith's 1934 story Triplanetary.

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