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Hollow-Face illusion. The Hollow-Face illusion (also known as Hollow-Mask illusion) is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. While a convex face will appear to look in a single direction, and the gaze of a flat face, such as the Lord Kitchener Wants You poster, can appear to ...
Richard Gregory was born in London. He was the son of Christopher Clive Langton Gregory, the first director of the University of London Observatory, and his first wife, Helen Patricia (née Gibson). [1][2] Gregory served with the Royal Air Force 's Signals branch during World War II, and after the war earned an RAF scholarship to Downing ...
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.
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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.
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 main article for this category is Optical illusion. See also: Category:Color appearance phenomena. Wikimedia Commons has media related to Optical illusions. An optical illusion is any illusion that deceives the human visual system into perceiving something that is not present or incorrectly perceiving what is present.
Rubin's vase (sometimes known as the Rubin face or the figure–ground vase) is a famous example of ambiguous or bi-stable (i.e., reversing) two-dimensional forms developed around 1915 by the Danish psychologist Edgar Rubin.