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.
Google Daydream
Daydream is a virtual reality (VR) platform developed by Google that is built into the Android mobile operating system (versions "Nougat" 7.1 and later). Compatible phones that follow the platform's software and hardware specifications (and are thus designated "Daydream-ready") are used in the Google Daydream View VR headset. The Daydream platform was announced at the Google I/O developer conference in May 2016, with the first VR headset released on November 10, 2016. Daydream is the company's second VR platform following Google Cardboard, which was a low-cost system intended to encourage interest in VR and was built into compatible mobile apps rather than the operating system itself.