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"Virtual" has had the meaning "being something in essence or effect, though not actually or in fact" since the mid-1400s, "...probably via sense of "capable of producing a certain effect" (early 1400s)".AR is a type of virtual reality technology that blends what the user sees in their real surroundings with digital content generated by computer software.Around the same time, Douglas Engelbart used computer screens both as input and output devices.In 1968, Ivan Sutherland, with the help of his student Bob Sproull, created what was widely considered to be the first head-mounted display (HMD) system for use in immersive simulation applications.
The graphics comprising the virtual environment were simple wire-frame model rooms.
He built a prototype of his vision dubbed the Sensorama in 1962, along with five short films to be displayed in it while engaging multiple senses (sight, sound, smell, and touch).
Predating digital computing, the Sensorama was a mechanical device.
Elements of virtual reality appeared as early as the 1860s.
French avant-garde playwright Antonin Artaud took the view that illusion was not distinct from reality, advocating that spectators at a play should suspend disbelief and regard the drama on stage as reality.