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2. Ambiguous image - Wikipedia

   en.wikipedia.org/wiki/Ambiguous_image

   Although there is no complete image to be seen, the brain is able to accomplish this because of its understanding of the physical world and real incidents of ambiguous lighting. [6] In ambiguous images, an illusion is often produced from illusory contours. An illusory contour is a perceived contour without the presence of a physical gradient.

3. Kokichi Sugihara - Wikipedia

   en.wikipedia.org/wiki/Kokichi_Sugihara

   Kōkichi Sugihara (Japanese: 杉原厚吉, born June 29, 1948, in Gifu Prefecture) [1] [2] is a Japanese mathematician and artist [3] known for his three-dimensional optical illusions that appear to make marbles roll uphill, [4] [5] pull objects to the highest point of a building's roof, [6] and make circular pipes look rectangular. [7]

4. Optical illusion - Wikipedia

   en.wikipedia.org/wiki/Optical_illusion

   Ambiguous illusions are pictures or objects that elicit a perceptual "switch" between the alternative interpretations. The Necker cube is a well-known example; other instances are the Rubin vase and the "squircle", based on Kokichi Sugihara's ambiguous cylinder illusion. [18] Distorting or geometrical-optical illusions are characterized by ...

5. Multistable perception - Wikipedia

   en.wikipedia.org/wiki/Multistable_perception

   Examples of visually ambiguous patterns. From top to bottom: Necker cube, Schroeder stairs and a figure that can be interpreted as black or white arrows. Multistable perception (or bistable perception) is a perceptual phenomenon in which an observer experiences an unpredictable sequence of spontaneous subjective changes.

6. Necker cube - Wikipedia

   en.wikipedia.org/wiki/Necker_cube

   The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame, two dimensional drawing of a cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.

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   www.aol.com/lifestyle/we-found-14-personalized...

   Personalized gifts don't have to be expensive or purchased months in advance. Give a thoughtful gift from Walmart this year, starting at just $5.