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  2. Will-o'-the-wisp - Wikipedia

    en.wikipedia.org/wiki/Will-o'-the-wisp

    The collected light from the eaten eyes gave "Boitatá" its fiery gaze. Not really a dragon but a giant snake (in the native language, boa or mboi or mboa). In Argentina and Uruguay, the will-o'-the-wisp phenomenon is known as luz mala (evil light) and is one of the most important myths in both countries' folklore. This phenomenon is quite ...

  3. Flicker (light) - Wikipedia

    en.wikipedia.org/wiki/Flicker_(light)

    In visual perception, flicker is a human-visible change in luminance of an illuminated surface or light source which can be due to fluctuations of the light source itself, or due to external causes such as due to rapid fluctuations in the voltage of the power supply (power-line flicker) or incompatibility with an external dimmer.

  4. Temporal light artefacts - Wikipedia

    en.wikipedia.org/wiki/Temporal_light_artefacts

    Temporal light artefacts (TLAs) are undesired effects in the visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects are flicker and stroboscopic effect. Flicker is a directly visible light modulation at relatively low frequencies (< 80 Hz) and small intensity modulation levels.

  5. Atmospheric ghost lights - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_ghost_lights

    Atmospheric ghost lights are lights (or fires) that appear in the atmosphere without an obvious cause. Examples include the onibi, hitodama and will-o'-wisp. They are often seen in humid climates. [1] According to legend, some lights are wandering spirits of the dead, the work of devils or yōkai, or the pranks of fairies. They are feared by ...

  6. Stroboscopic effect - Wikipedia

    en.wikipedia.org/wiki/Stroboscopic_effect

    Intentional light variations are applied for warning, signalling (e.g. traffic-light signalling, flashing aviation light signals), entertainment (like stage lighting) with the purpose that flicker is perceived by people. Generally, the light output of lighting equipment may also have residual unintentional light level modulations due to the ...

  7. Flicker vertigo - Wikipedia

    en.wikipedia.org/wiki/Flicker_vertigo

    Flicker vertigo, sometimes called the Bucha effect, is "an imbalance in brain-cell activity caused by exposure to low-frequency flickering (or flashing) of a relatively bright light." [ 1 ] It is a disorientation -, vertigo -, and nausea -inducing effect of a strobe light flashing at 1 Hz to 20 Hz, approximately the frequency of human brainwaves .

  8. 'Twas the Night Before Christmas Full Poem and History - AOL

    www.aol.com/twas-night-christmas-full-poem...

    One of the most beloved Christmas stories is 'Twas the Night Before Christmas.While almost everyone is familiar with the sweet holiday rhyming tale, the story behind the story is one that is ...

  9. Light characteristic - Wikipedia

    en.wikipedia.org/wiki/Light_characteristic

    A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".

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