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An autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene. Autostereograms use only one image to accomplish the effect while normal stereograms require two. The 3D scene in an autostereogram is often unrecognizable until it is viewed properly, unlike typical stereograms.
In the computer industry, the inverted text usually displays a selected block of text, the current menu item. Many older people have a slight, comfortable astigmatism. At the high resolution of modern computer screens, they better see black letters on white background rather than vice versa. Therefore, long reversed texts are rare.
The most common way around these problems was to use images of text, which can then be rotated and transformed in an image editor at will, and to represent the text in those images with the alt attribute so that search engines and text-only browsers can read it properly.
An intriguing catchphrase typography upside down invites the reader to rotate the magazine, in which the first names "Michael" or "Peter" are transformed into "Nathalie" or "Alice". [107] [108] In 2015 iSmart's logo on one of its travel chargers went viral because the brand's name turned out to be a natural ambigram that read "+Jews!" upside down.
Backmasking is a recording technique in which a message is recorded backward onto a track that is meant to be played forward. [1] It is a deliberate process, whereas a message found through phonetic reversal may be unintentional.
Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred to as beghilos (or ...
A delay is caused when processing inverted faces compared to upright faces. This is because the specific holistic mechanism (see holistic processing) that allows faces to be quickly detected is absent when processing inverted faces. Only local information is available when viewing inverted faces, disrupting this early recognition stage and ...
Rare example of an ambiguous image that can be interpreted in more than two ways: as the letters "KB", the mathematical inequality "1 < 13" or the letters "VD" with their mirror image. [7] When we see an image, the first thing we do is attempt to organize all the parts of the scene into different groups. [8]