In 1968, a Harvard professor and computer scientist named Ivan Sutherland created what he called "The Sword of Damocles". He invented this first sort of augmented reality device with his student, Bob Sproull. The Sword of Damocles is a head-mounted display that hung from the ceiling. The user would experience computer graphics, which made them feel as if they were in an alternate reality. This technology may be considered closer to VR than AR, but it's a start!