I believe an Eidophor projection system was used in the late 1970's to make possible the large screen display shown in Put That There [0] which was an influential early natural language interface (if you do check out the video, try to keep in mind just how long ago the 1970's were, how limited the compute power was, and that the interactions in the video are real speech interactions, not a canned demo - Siri was still more than 30 years in the future and the 140x192 pixel color display on the Apple II was a revolutionary innovation for the time. Put That There was truly the stuff of Science Fiction made real).