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  2. 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 ...

  3. Transparent eyeball - Wikipedia

    en.wikipedia.org/wiki/Transparent_eyeball

    Transparent eyeball. The transparent eyeball is a philosophical metaphor originated by American transcendentalist philosopher Ralph Waldo Emerson. In his essay Nature, the metaphor stands for a view of life that is absorbent rather than reflective, and therefore takes in all that nature has to offer without bias or contradiction.

  4. Four sights - Wikipedia

    en.wikipedia.org/wiki/Four_sights

    Four sights. Siddharta sees the dead man, China, 15th-century printed and hand-coloured edition of Baocheng's biography. The four sights are four events described in the legendary account of Gautama Buddha 's life which led to his realization of the impermanence and the ultimate dissatisfaction of conditioned existence.

  5. Color psychology - Wikipedia

    en.wikipedia.org/wiki/Color_psychology

    Color psychology is the study of colors and hues as a determinant of human behavior. Color influences perceptions that are not obvious, such as the taste of food. Colors have qualities that can cause certain emotions in people. [1] How color influences individuals may differ depending on age, gender, and culture. [2] Although color associations can vary contextually between cultures, color ...

  6. 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.

  7. Divine light - Wikipedia

    en.wikipedia.org/wiki/Divine_light

    In theology, divine light (also called divine radiance or divine refulgence) is an aspect of divine presence perceived as light during a theophany or vision, or represented as such in allegory or metaphor . Light has always been associated with a religious and philosophical symbolic meaning, considered a source of not only physical but ...

  8. Theory of Colours - Wikipedia

    en.wikipedia.org/wiki/Theory_of_Colours

    318274261. Light spectrum, from Theory of Colours – Goethe observed that colour arises at the edges, and the spectrum occurs where these coloured edges overlap. Theory of Colours (German: Zur Farbenlehre) is a book by Johann Wolfgang von Goethe about the poet's views on the nature of colours and how they are perceived by humans.

  9. Problem of universals - Wikipedia

    en.wikipedia.org/wiki/Problem_of_universals

    The problem of universals is an ancient question from metaphysics that has inspired a range of philosophical topics and disputes: "Should the properties an object has in common with other objects, such as color and shape, be considered to exist beyond those objects? And if a property exists separately from objects, what is the nature of that existence?" [1]