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2. List of optical illusions - Wikipedia

   en.wikipedia.org/wiki/List_of_optical_illusions

   The Hering illusion (1861): When two straight and parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Hollow-Face illusion: 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.

3. Dragon curve - Wikipedia

   en.wikipedia.org/wiki/Dragon_curve

   Heighway dragon curve. A dragon curve is any member of a family of self-similar fractal curves, which can be approximated by recursive methods such as Lindenmayer systems.The dragon curve is probably most commonly thought of as the shape that is generated from repeatedly folding a strip of paper in half, although there are other curves that are called dragon curves that are generated differently.

4. 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]

5. 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]

6. Lenticular printing - Wikipedia

   en.wikipedia.org/wiki/Lenticular_printing

   Lenticular print showing double images and ghosting Double images on the relief and in depth. Double images are usually caused by an exaggeration of the 3D effect from some angles of view, or an insufficient number of frames. Poor design can lead to doubling, small jumps, or a fuzzy image, especially on objects in relief or in depth.

7. Penrose triangle - Wikipedia

   en.wikipedia.org/wiki/Penrose_triangle

   A 3D-printed version of the Reutersvärd Triangle illusion. M.C. Escher's lithograph Waterfall (1961) depicts a watercourse that flows in a zigzag along the long sides of two elongated Penrose triangles, so that it ends up two stories higher than it began. The resulting waterfall, forming the short sides of both triangles, drives a water wheel.

8. Hollow-Face illusion - Wikipedia

   en.wikipedia.org/wiki/Hollow-Face_illusion

   This result suggests that the bottom-up cues that drive the flicking response are distinct from the top-down cues that drive the Hollow-Face illusion. Another example of the Hollow-Face illusion is the "Gathering 4 Gardner" dragon. This dragon's head seems to follow the viewer's eyes everywhere (even up or down), when lighting, perspective and ...

9. Illusion - Wikipedia

   en.wikipedia.org/wiki/Illusion

   An auditory illusion is an illusion of hearing, the auditory equivalent of a visual illusion: the listener hears either sounds which are not present in the stimulus, or "impossible" sounds. In short, audio illusions highlight areas where the human ear and brain, as organic, makeshift tools, differ from perfect audio receptors (for better or for ...