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  2. Synesthesia - Wikipedia

    en.wikipedia.org/wiki/Synesthesia

    Synesthesia A person with synesthesia may associate certain letters and numbers with certain colors. Most synesthetes see characters just as others do (in whichever color actually displayed) but they may simultaneously perceive colors as associated with or evoked by each one.

  3. Color vision - Wikipedia

    en.wikipedia.org/wiki/Color_vision

    Color vision. Color vision, a feature of visual perception, is an ability to perceive differences between light composed of different frequencies independently of light intensity. Color perception is a part of the larger visual system and is mediated by a complex process between neurons that begins with differential stimulation of different ...

  4. Color theory - Wikipedia

    en.wikipedia.org/wiki/Color_theory

    Color theory. Color theory, or more specifically traditional color theory, is the historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. [1] Modern color theory is generally referred to as Color science.

  5. Green, red and purple: The colorful science behind the ...

    www.aol.com/weather/green-red-purple-colorful...

    Green, red and purple: The colorful science behind the northern lights Seeing the Aurora Borealis dance in the night sky is a bucket list item for many, and just like snowflakes, no two displays ...

  6. Purple Earth hypothesis - Wikipedia

    en.wikipedia.org/wiki/Purple_Earth_hypothesis

    The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [1] that the earliest photosynthetic life forms of Early Earth were based on the simpler molecule retinal rather than the more complex porphyrin -based chlorophyll, making the surface biosphere appear purplish rather than its current greenish color. [2] [3] It ...

  7. Atmospheric optics - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_optics

    Atmospheric opticsis "the study of the opticalcharacteristics of the atmosphereor products of atmospheric processes .... [including] temporal and spatial resolutions beyond those discernible with the naked eye".[1] Meteorological opticsis "that part of atmospheric optics concerned with the study of patterns observable with the naked eye".[2] Nevertheless, the two terms are sometimes used ...

  8. If You See a Purple Porch Light, This Is What It Means - AOL

    www.aol.com/lifestyle/see-purple-porch-light...

    Here's the meaning of purple porch lights. The post If You See a Purple Porch Light, This Is What It Means appeared first on Reader's Digest.

  9. Color constancy - Wikipedia

    en.wikipedia.org/wiki/Color_constancy

    Color constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset ...