BRmovie.com: Blade Runner Souvenir Magazine - Official Collector's Edition

Above (and top): Deckard works with the extraordinary Esper machine tracing clues to the replicants whereabouts. the computer follows Deckard's verbal instructions, zooming in on a very small part of a photograph Deckard found in Leon's apartment

Syd Mead's early design concept for the esper machine. This futuristic computer emits a high-frequency sound as it takes verbal instructions to search for a sparkling photograph in 3-D.