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  2. Blue field entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon

    In a technique known as blue field entoptoscopy, the effect is used to estimate the blood flow in the retinal capillaries.The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of these dots, the patient tries to match the computer generated picture to the perceived entoptic dots.

  3. Myscelia cyaniris - Wikipedia

    en.wikipedia.org/wiki/Myscelia_cyaniris

    The sapphire blue of the upper wings may appear black or neon blue depending on how the light is reflected. The undersides of the hindwings have a cryptic coloration, as they are mottled with different shades of color, varying from gray to brown, while the under sides of the forewings are black with white patches.

  4. Insect wing - Wikipedia

    en.wikipedia.org/wiki/Insect_wing

    On the right hand side of the forewing is opened to the right (blue arrow), which from this perspective appears narrower than it is with the rear wing still folded completely. . The front wing is open to the left (blue arrow) with the right side of the forewing removed; the hindwing is half open.

  5. Transparency (graphic) - Wikipedia

    en.wikipedia.org/wiki/Transparency_(graphic)

    an image that is not rectangular can be filled to the required rectangle using transparent surroundings; the image can even have holes (e.g. be ring-shaped) in a run of text, a special symbol for which an image is used because it is not available in the character set, can be given a transparent background, resulting in a matching background.

  6. File:Impossible Colors, Blue and Yellow.gif - Wikipedia

    en.wikipedia.org/wiki/File:Impossible_Colors...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses ...

  7. Mass psychogenic illness - Wikipedia

    en.wikipedia.org/wiki/Mass_psychogenic_illness

    Bartholomew and Wessely state that it "seems clear that there is no particular predisposition to mass sociogenic illness and it is a behavioural reaction that anyone can show in the right circumstances." [5] Intense media coverage seems to exacerbate outbreaks. [8] [10] [6] The illness may also recur after the initial outbreak. [6]

  8. Mr. Yuk - Wikipedia

    en.wikipedia.org/wiki/Mr._Yuk

    Possible expressions were "mad" (crossed eyes and intense expression), "dead" (a sunken mouth and Xs for eyes), and "sick" (a sour expression with the tongue sticking out). [3] Children were asked to rank the faces according to which they liked the best, along with the skull and crossbones, and the "sick" face was least popular. [ 3 ]

  9. Worry - Wikipedia

    en.wikipedia.org/wiki/Worry

    A young girl looking worried. Worry is a category of perseverative cognition, i.e. a continuous thinking about negative events in the past or in the future. [3] As an emotion "worry" is experienced from anxiety or concern about a real or imagined issue, often personal issues such as health or finances, or external broader issues such as environmental pollution, social structure or ...