The first reflection travels one centimeter to the rear mirror and then two centimeters to, and through the front mirror, a total of three centimeters. The reflections appear to recede into the distance because the light actually is traversing the distance it appears to be traveling.įor example, in a two-centimeter-thick infinity mirror, with the light sources halfway between, light from the source initially travels one centimeter. The 3D illusion mirror effect is produced whenever there are two parallel reflective surfaces which can bounce a beam of light back and forth an indefinite (theoretically infinite) number of times. The partially-reflective glass produces this sensation, diluted by the visual noise of the views through the glass into the surrounding environment. A weaker version of this effect can be seen by standing between any two parallel reflective surfaces, such as the glass walls of a small entry lobby into some buildings. Alternatively, this effect can also be seen when an observer stands between two parallel fully reflective mirrors, as in some dressing rooms, some elevators, or a house of mirrors.
If the mirrors are not precisely parallel but instead are canted at a slight angle, the "visual tunnel" will be perceived to be curved off to one side, as it recedes into infinity.
When an outside observer looks into the surface of the partially reflective mirror, the lights appear to recede into infinity, creating the appearance of a tunnel of great depth that is lined with lights. In a classic self-contained infinity mirror, a set of light bulbs, LEDs, or other point-source lights are placed around the periphery of a fully reflective mirror, and a second, partially reflective " one-way mirror" is placed a short distance in front of it, in a parallel alignment. An infinity mirror effect viewed between paired mirrors in a public bathroom
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