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  2. Motion aftereffect - Wikipedia

    en.wikipedia.org/wiki/Motion_aftereffect

    The motion aftereffect is believed to be the result of motion adaptation. For example, if one looks at a waterfall for about a minute and then looks at the stationary rocks at the side of the waterfall, these rocks appear to be moving upwards slightly. The illusory upwards movement is the motion aftereffect.

  3. Illusory motion - Wikipedia

    en.wikipedia.org/wiki/Illusory_motion

    Billboards and other electronic signs use apparent motion to simulate moving text by flashing lights on and off as if the text is moving.. The term illusory motion, or motion illusion or apparent motion, refers to any optical illusion in which a static image appears to be moving due to the cognitive effects of interacting color contrasts, object shapes, and position. [1]

  4. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The barber pole illusion is a visual illusion that reveals biases in the processing of visual motion in the human brain. Benham's top: When a disk that has lines or colours on it is spun, it can form arcs of colour. Beta movement: Movement that appears to occur when fixed pictures turn on and off. Bezold Effect

  5. Autokinetic effect - Wikipedia

    en.wikipedia.org/wiki/Autokinetic_effect

    It was first recorded in 1799 by Alexander von Humboldt who observed illusory movement of a star in a dark sky, although he believed the movement was real. [2] It is presumed to occur because motion perception is always relative to some reference point, and in darkness or in a featureless environment there is no reference point, so the position ...

  6. Peripheral drift illusion - Wikipedia

    en.wikipedia.org/wiki/Peripheral_drift_illusion

    The peripheral drift illusion (PDI) refers to a motion illusion generated by the presentation of a sawtooth luminance grating in the visual periphery. This illusion was first described by Faubert and Herbert (1999), although a similar effect called the "escalator illusion" was reported by Fraser and Wilcox (1979).

  7. Ambiguous image - Wikipedia

    en.wikipedia.org/wiki/Ambiguous_image

    An illusory contour is a perceived contour without the presence of a physical gradient. In examples where a white shape appears to occlude black objects on a white background, the white shape appears to be brighter than the background, and the edges of this shape produce the illusory contours. [9]

  8. Fire and Water Fountain - Wikipedia

    en.wikipedia.org/wiki/Fire_and_Water_Fountain

    Agam has gained international recognition as one of the founders of the kinetic art movement. The fountain consists of an illusory dimension and a movement dimension, both typical to works of Kinetic art and Op art, which is achieved by the use of technology and by the observer's movement. The fountain is composed of several big jagged wheels ...

  9. Category:Wikipedia non-free audio samples - Wikipedia

    en.wikipedia.org/wiki/Category:Wikipedia_non...

    A. File:A Camp - Stronger Than Jesus.ogg; File:A Change Is Gonna Come sample.ogg; File:A Day in the Life of a Tree.ogg; File:A Day in the Life verse - Beatles.ogg