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An example of the scintillating grid illusion. Dark dots seem to appear and disappear at intersections. The scintillating grid illusion is an optical illusion, discovered by E. and B. Lingelbach and M. Schrauf in 1994. [2] It is often considered a variation of the Hermann grid illusion but possesses different properties. [2] [3]
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.
A random-dot stereogram (RDS) is stereo pair of images of random dots that, when viewed with the aid of a stereoscope, or with the eyes focused on a point in front of or behind the images, produces a sensation of depth due to stereopsis, with objects appearing to be in front of or behind the display level.
The third pictured, alchemical for black sulfur, is also known as a 'Leviathan Cross' or 'Satan's Cross'. Sun: Alchemy and Hermeticism: A symbol used with many different meanings, including but not limited to, gold, citrinitas, sulfur, the divine spark of man, nobility and incorruptibility. Sun cross: Iron Age religions and later gnosticism and ...
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What it looks like: Rosacea causes redness and thick skin on the face, usually clustered in the center. Easy flushing, a stinging sensation, and small, pus-filled pimples are other common signs of ...
Dual portrait of a black woman and a white woman, identities unknown, circa 1650, by an anonymous hand. The two women, who appear to be of equal standing, are wearing face patches, which were a fashion of the time. The painting is captioned "I black with white bespott y white with blacke this evil proceeds from thy proud hart then take her ...
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