Fog display

{{Distinguish|liquid vapor display|smoke screen}}

A fog display, fog screen, vapor screen or vapor display is a system that uses haze machines or water vapor to create a semi-transparent wall, or "curtain" of suspended particles which trapped in a thin sheet (laminar flow) of air and are illuminated by a projector,{{cite web|url=http://prosauce.org/blog/2012/6/10/how-to-diy-improved-inexpensive-fog-screen.html |title=How To: DIY (Improved) Inexpensive Fog Screen - Blog |publisher=proSauce |date=2012-06-10 |access-date=2013-10-23}} in order to produce a display whose images seem to float in mid air.{{cite web|url=http://blog.makezine.com/2012/01/04/princess-leia-hologram-vapor-display/ |title=Princess Leia "Hologram" Vapor Display |work=MAKE |publisher=Blog.makezine.com |date=4 January 2012 |first=Sean Michael |last=Ragan |access-date=23 October 2013}} Several commercial systems exist, such as FogScreen, Displair and Heliodisplay. There is also an open-source variant being developed called Hoverlay II[https://github.com/makertum/Hoverlay-II Hoverlay II github page][http://makertum.com/en/hoverlay-2/ Makertum Hoverlay II device]

The fog screen projection system is mainly composed of a projector, a fog screen generator, a water tank, a computer, a controller, holographic presentation content (videos and images), and some auxiliary equipment, such as wires.{{cite web |url =https://www.klmultimedia.com/fog-projection.html |first= |last= |date= |title =Fog Screen |work =klmultimedia }} This system can be expanded using multiple projectors to create a three-dimensional image, thus becoming a volumetric 3D display.{{cite web |url = https://www.engadget.com/2011/03/17/3d-fog-projection-display-brings-purple-bunnies-to-life-just-in/ |first= Tim |last=Stevens |date = 17 March 2011 |title = 3D fog projection display brings purple bunnies to life, just in time to lay chocolate eggs (video) |work = Engadget }}