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light

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Overview

Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometers (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared and the ultraviolet, called collectively optical radiation.

From Wikipedia (CC BY-SA 4.0).

Notable quotes

“It is manifest that everything in the world, whether it be substance or accident, produces rays in its own manner like a star... Everything that has actual existence in the world of the elements emits rays in every direction, which fill the whole world.”
— , De Causis diuersitatum aspectus et dandis demonstrationibus geometricus super eas, also known as De Aspectibus (ca. 860) as quoted by , Theories of Vision from Al-kindi to Kepler (1976)
“There is strong shadow where there is much light.”
— Johann Wolfgang von Goethe, Götz von Berlichingen, Act I (1773).
“Genius is not so much a light as it is a constant awareness of the surrounding gloom.”
— Stanisław Lem, in His Master's Voice (1968) as translated by Michael Kandel (1983).
“In the right light, at the right time, everything is extraordinary.”
— Aaron Rose, quoted in The Reader's Digest Vol. 152 (1998), p. 185, also in Live in the Light : A Journal of Self-Enlightenment (2003) by Mary Engelbreit.
“Light is the first of painters. There is no object so foul that intense light will not make it beautiful.”
— Ralph Waldo Emerson, Nature, Chapter III.
“But it is not necessary to light a candle to the sun.”
— Algernon Sidney, Discourses on Government, Chapter II, Section XXIII.

Quotes via Wikiquote (CC BY-SA), each with its original source.

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