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The Oxford Companion to Consciousness suggests as a way to understand "Shepard’s many-legged elephant": "try slowly uncovering the elephant from the top, or from the bottom." (If you cover the bottom of the drawing, you see the top of an elephant with four legs. If you cover the drawing's top, you see four elephant feet, plus trunk and tail.) [5]
The magnitude of the illusion depends on the properties of the obscuring pattern and the nature of its borders. [ 3 ] Many detailed studies of the illusion, including "amputating" various components [ 4 ] [ 5 ] point to its principal cause: acute angles in the figure are seen by viewers as expanded [ 6 ] [ 7 ] though the illusion diminishes or ...
The widely accepted interpretation of, e.g. the Poggendorff and Hering illusions as manifestation of expansion of acute angles at line intersections, is an example of successful implementation of a "bottom-up," physiological explanation of a geometrical–optical illusion. Ponzo illusion in a purely schematic form and, below, with perspective clues
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
Each contained extensive scientific and practical information on anamorphic imagery. In Niceron's work, three types of large-scale anamorphism are explained: 'optical' (looking horizontally); 'anoptric' (looking upwards); and 'catoptric' (looking down i.e. from a mezzanine). A conical perspective is also described.
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 ...
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.
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 ...