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The Thatcher effect or Thatcher illusion is a phenomenon where it becomes more difficult to detect local feature changes in an upside-down face, despite identical changes being obvious in an upright face. It is named after the then British prime minister Margaret Thatcher, on whose photograph the effect was first demonstrated.
Troxler's fading, also called Troxler fading or the Troxler effect, is an optical illusion affecting visual perception. When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point will fade away and disappear. Research suggests that at least some portion of the perceptual phenomena ...
Optical illusion is also used in film by the technique of forced perspective . Op art is a style of art that uses optical illusions to create an impression of movement, or hidden images and patterns. Trompe-l'œil uses realistic imagery to create the optical illusion that depicted objects exist in three dimensions.
The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. Hybrid image. A Hybrid image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. Illusory contours.
From the mid-19th century, the illusion, today known as Pepper's Ghost, became widely developed for money-making stage entertainments, amid bitter argument, patent disputes, and legal action concerning the technique's authorship. A popular genre of entertainment was stage demonstrations of scientific novelties.
Flashed face distortion effect. The flashed face distortion effect is a visual illusion involving the fast-paced presentation of eye-aligned faces. [ 1] Faces appear grotesquely transformed while the viewer focuses on the cross midway between them. [ 2][ 3] As with many scientific discoveries, the phenomenon was first observed by chance.
Ames room. Photograph of two adults standing in an Ames room, apparently with a significant difference in size. An Ames room is a distorted room that creates an optical illusion. Likely influenced by the writings of Hermann Helmholtz, [ 1] it was invented by American scientist Adelbert Ames Jr. in 1946, [ 2] and constructed in the following year.
Psychosis, delirium, or dementia [ 1] Visual release hallucinations, also known as Charles Bonnet syndrome or CBS, are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations . First described by Charles Bonnet in 1760, [ 2][ 3] the term Charles Bonnet syndrome was first ...
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