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Any kind of grid that deceives a person's vision. The two most common types of grid illusions are the Hermann grid illusion (1870) and the scintillating grid illusion (1994). The first is characterized by "ghostlike" grey blobs perceived at the intersections of a white (or light-colored) grid on a black background.
Yehudi Lights flight path in crosswind to keep 3 degree wide cones of light from nose pointing straight at the enemy. Pilots noted that if they chose a straight-line heading to compensate for a crosswind, the nose of the plane would not point directly at the enemy, but could be, say, 20 degrees off. Since making the beams bright enough at such ...
In visual perception, flicker is a human-visible change in luminance of an illuminated surface or light source which can be due to fluctuations of the light source itself, or due to external causes such as due to rapid fluctuations in the voltage of the power supply (power-line flicker) or incompatibility with an external dimmer.
With the cloaking device active, light is 'deflected' around the object to make it appear as if it did not exist, rendering it invisible. A cloaking device is a hypothetical or fictional stealth technology that can cause objects, such as spaceships or individuals, to be partially or wholly invisible to parts of the electromagnetic (EM) spectrum .
Lighting is the deliberate use of light to achieve a practical or aesthetic effect.. Types of lighting include: Christmas lighting; Automotive lighting. Emergency vehicle lighting
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