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  2. Spectropia - Wikipedia

    en.wikipedia.org/wiki/Spectropia

    Plate XIV. Brown was distressed by an increased public interest in spiritualism, [7] something which he deemed a "mental epidemic." [8] By offering a scientific explanation on the properties of light, color, and the structure of the eyes, [1] he states in the section "Popular and Scientific description" that the purpose in writing Spectropia was to bring forth "the extinction of the ...

  3. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    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

  4. Perceived visual angle - Wikipedia

    en.wikipedia.org/wiki/Perceived_visual_angle

    An optical illusion where the physical and subjective angles differ is then called a visual angle illusion or angular size illusion. Angular size illusions are most obvious as relative angular size illusions, in which two objects that subtend the same visual angle appear to have different angular sizes; it is as if their equal-sized images on ...

  5. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    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.

  6. Oppel-Kundt illusion - Wikipedia

    en.wikipedia.org/wiki/Oppel-Kundt_illusion

    The part of the figure filled with some elements (upper, discretely; lower, continuously) seems longer than the unfilled part of the same lengthThe Oppel-Kundt illusion is a geometric optical illusion that occurs when comparing the sizes of filled (with some visual elements, distractors) and unfilled parts of the image (for most observers, the filled part seems larger).

  7. This train track optical illusion has derailed the entire ...

    www.aol.com/news/2016-04-08-this-train-track...

    In this illusion, two figures that are identical (i.e. the two train track segments) appears to be different sizes while lying perpendicular to each other on a flat surface -- the lower one ...

  8. Ambiguous image - Wikipedia

    en.wikipedia.org/wiki/Ambiguous_image

    The rabbit–duck illusion. Middle vision is the stage in visual processing that combines all the basic features in the scene into distinct, recognizable object groups. This stage of vision comes before high-level vision (understanding the scene) and after early vision (determining the basic features of an image).

  9. The optical illusion hidden in the 'Mona Lisa' explained - AOL

    www.aol.com/news/2015-08-22-the-optical-illusion...

    Art historians say Leonardo da Vinci hid an optical illusion in the Mona Lisa's face: she doesn't always appear to be smiling. There's question as to whether it was intentional, but new research ...

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