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.
Carolina Cruz-Neira
The first CAVE was invented by Carolina Cruz-Neira, Daniel J. Sandin, and Thomas A. DeFanti in 1992. For her PhD dissertation, Cruz-Neira designed and developed the CAVE Automatic Virtual Environment, its specifications, and implementation. She also designed and implemented the CAVELib software API, now a commercial product. She was the architect of the Open Source API VR Juggler, an open source virtual reality applications development framework.