Virtual reality
Around the same time, Douglas Engelbart used computer screens both as input and output devices. In 1968, Ivan Sutherland, with the help of many students including Bob Sproull, created what was widely considered to be the first head-mounted display (HMD) system for use in immersive simulation applications. It was primitive both in terms of user interface and realism, and the HMD to be worn by the user was so heavy that it had to be suspended from the ceiling. The graphics comprising the virtual environment were simple wire-frame model rooms. The formidable appearance of the device inspired its name, The Sword of Damocles.
Marcus Weller
Weller invented the Skully AR-1. The AR-1 was to be the first vertically integrated, smart, Heads-Up Display (HUD) helmet for consumers. The HUD system displays at a virtual distance of in front of the rider. The AR-1 was to feature a near 180-degree rear-view camera, turn-by-turn GPS navigation, smartphone pairing and voice control. Weller also served as Skully CEO until July 2016, and the company shut down later the same month.