Some AR systems use a camera to capture the user's surroundings or some type of display screen which the user looks at (e.g., Microsoft's Holo Lens, Magic Leap).
The immersive environment can be similar to the real world in order to create a lifelike experience grounded in reality or sci-fi.
Augmented reality systems may also be considered a form of VR that layers virtual information over a live camera feed into a headset, or through a smartphone or tablet device.
This tactile information is generally known as force feedback in medical, video gaming and military training applications.
In 1938, Antonin Artaud described the illusory nature of characters and objects in the theatre as "la réalité virtuelle" in a collection of essays, Le Théâtre et son double.
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.
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.
The first references to the more modern concept of virtual reality came from science fiction.
The couple have been spending time together at Katie's apartment in Chelsea, New York, and she also stayed at the Trump Soho Hotel with him for a night while he was filming his new movie Annie in mid-September after which his driver brought her home the next morning.