30 Before-and-After Photos That Show How Much the World Has Changed

THEN: Computer scientist Ivan Sutherland invented the first virtual reality head-mounted display system with his student, Bob Sproull, in 1968.

Dubbed The Sword of Damocles, Sutherland and Sproull’s design was so heavy that it had to be suspended from the ceiling and strapped onto someone’s head in order to be used.

Unlike AR, virtual reality (VR) completely replaces the real world with a computer-generated simulation. Since The Sword of Damocles was somewhat transparent, it’s also considered an early form of modern AR technology as well.

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