Novelty | Disappearing Wall
One-way vision window graphics disappear from view when a bright light source is positioned behind them. This is a trick of the eye which has been used in museums and theatre. For example, a museum used Contra Vision on a front illuminated glass panel to show graphics and text about an exhibit. At the flick of a switch the illumination on the front panel is removed and a bright light box behind is turned on to reveal objects behind. As a result the front glass panel disappears from view and the bright light behind is the source of attention.