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.
Hyper Reality Experience
The Hyper Reality Experience is claimed to be the UK's first Virtual Reality game experience, and was created by Ali Khan, a former J. P. Morgan executive, and Samrien Hussain, a former school sports development co-ordinator, who also run the multi-city chain of escape games "Tick Tock Unlock" in The United Kingdom.