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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]
A trompe-l'œil body painting by Joanne Gair. The dress: An optical illusion resulting from the brain's attempt to discount coloured tinting from daylight and other sources. [1] The dress was a viral phenomenon, which was either seen as blue and black or as white and gold. Its true colours were eventually confirmed to be blue and black. [2]
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.
A dream has been defined by some (e.g. Encyclopædia Britannica) as a hallucinatory experience during sleep. A lucid dream may be defined as one in which the dreamer is aware that they are asleep and dreaming. The term 'lucid dream' was first used by the Dutch physician Frederik van Eeden, [12] who studied his own dreams of this type. The word ...
Visual snow: dynamic, continuous, tiny dots observed across the entire visual field at any time of the day, regardless of lighting conditions, persisting for more than three months. The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored.
A dream dictionary (also known as oneirocritic literature) is a tool made for interpreting images in a dream. Dream dictionaries tend to include specific images which are attached to specific interpretations. However, dream dictionaries are generally not considered scientifically viable by those within the psychology community.
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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 ...