“The most beautiful discoveries since the Renaissance, indeed since the beginnings of all science, are the laws governing light, whether moving through a uniform medium, or being reflected from an opaque surface, or changing direction upon entering another transparent medium.”

—  Pierre Louis Maupertuis

Accord de différentes loix de la nature qui avoient jusqu’ici paru incompatibles (1744)

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Pierre Louis Maupertuis 24
French mathematician, philosopher and man of letters 1698–1759

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Pierre Louis Maupertuis photo

“The ancient Greeks knew the laws that govern the propagation of light in a uniform medium and upon its reflection. However, the law governing the refraction of light as it passes from one transparent medium to another was unknown until the last century. Snell discovered it, Descartes tried to explain it and Fermat criticized his explanation. Since then, many great geometers have researched the problem, although no one has yet found a way of harmonizing the law of refraction with more fundamental laws that Nature must obey.”

Pierre Louis Maupertuis (1698–1759) French mathematician, philosopher and man of letters

Accord de différentes loix de la nature qui avoient jusqu’ici paru incompatibles (1744)

Pierre Louis Maupertuis photo

“The first law is the same for both light and material bodies; they both move in a straight line, as long as they are not deflected by an outside force.
The second law is also the same as that governing the reflection of an elastic ball from an impenetrable surface. Mechanics shows that such a ball is reflected from such a surface so that its angle of reflection equals its angle of incidence, as observed for light.
But the third law still requires a plausible explanation. The passage of light from one medium to another exhibits behavior that is totally different from a ball moving through different media.”

Pierre Louis Maupertuis (1698–1759) French mathematician, philosopher and man of letters

Accord de différentes loix de la nature qui avoient jusqu’ici paru incompatibles (1744)

Pierre Louis Maupertuis photo

“The refraction of light agrees with the grand principle that Nature always uses the simplest means to accomplish its effects. From this principle, can be derived whenever light passes from one medium to another, the ratio of the sine of the angle of refraction to the sine of the angle of refraction equals the inverse ratio of the speeds at which light moves in each medium.
But this "budget", this expense of action that Nature minimizes in the refraction of light, is it also minimized in the direct propagation and reflection of light? Yes, it always has the smallest possible value.”

Pierre Louis Maupertuis (1698–1759) French mathematician, philosopher and man of letters

Accord de différentes loix de la nature qui avoient jusqu’ici paru incompatibles (1744)

Lawrence M. Krauss photo

“Now, since the time of Newton there had been a debate about whether light was a wave---that is, a traveling disturbance in some background medium---or a particle, which travels regardless of the presence of a background medium. The observation of Maxwell that electromagnetic waves must exist and that their speed was identical to that of light ended the debate: light was an electromagnetic wave.”

Lawrence M. Krauss book The Physics of Star Trek

The Physics of Star Trek, HarperPerennial edition (1996), p. 17.

Hans Reichenbach photo

“If the definition of simultaneity is given from a moving system, the spherical surface will result when Einstein's definition with є = 1/2 is used, since it is this definition which makes the velocity of light equal in all directions.”

Hans Reichenbach (1891–1953) American philosopher

The Philosophy of Space and Time (1928, tr. 1957)

Robert Grosseteste photo

“I hold that the first form of a body is the first corporeal mover. But this is light, which as it multiplies itself and expands without the body of matter moving with it, makes its passage instantaneously through the transparent medium and is not motion but a state of change. But, indeed, when light is expanding itself in different directions it is incorporated with matter, if the body of matter extends with it, and it makes a rarefaction or augmentation of matter; for when light is itself charged with the body of matter, it produces condensation or rarefaction. So when light generates itself in one direction drawing matter with it, it produces local motion; and when light within matter is sent out and what is outside is sent in, it produces qualitative change. From this it is clear that corporeal motion is a multiplicative power of light, and this is a corporeal and natural appetite.”

Robert Grosseteste (1175–1253) English bishop and philosopher

see De Luce Tr. Ludwig Baur (1912) pp. 51-52
De Luce seu de Inchoatione Formarum (c. 1215-1220)

Isaac Newton photo

“Is not the Heat of the warm Room convey'd through the Vacuum by the Vibrations of a much subtiler Medium than Air, which after the Air was drawn out remained in the Vacuum? And is not this Medium the same with that Medium by which Light is refracted and reflected and by whose Vibrations Light communicates Heat to Bodies, and is put into Fits of easy Reflexion and easy Transmission?… And do not hot Bodies communicate their Heat to contiguous cold ones, by the Vibrations of this Medium propagated from them into the cold ones? And is not this Medium exceedingly more rare and subtile than the Air, and exceedingly more elastick and active? And doth it not readily pervade all Bodies? And is it not (by its elastick force) expanded through all the Heavens?”

Isaac Newton book Opticks, or a Treatise of the Reflections, Refractions, Inflections and Colours of Light

Query 18
Opticks (1704)

Mark Rothko photo

“Like the Cubists before them, the abstractionists felt a beautiful thing in perceiving how the medium can, of its own accord, carry one into the unknown, that is to the discovery of new structures. What an inspiration the medium is..”

Mark Rothko (1903–1970) American painter

Source: 1940's, Beyond the Aesthetics (1946), pp. 39-40

J. Sheridan Le Fanu photo

“I remember everything about it—with an effort. I see it all, as divers see what is going on above them, through a medium, dense, rippling, but transparent.”

J. Sheridan Le Fanu book Carmilla

Source: Carmilla

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“Man is not the enemy of man, but through the medium of a false system of Government.”

Thomas Paine book Rights of Man

Part 1.7 Conclusion
1790s, Rights of Man, Part I (1791)
Context: Man is not the enemy of man, but through the medium of a false system of Government. Instead, therefore, of exclaiming against the ambition of kings, the exclamation should be directed against the principle of such governments; and instead of seeking to reform the individual, the wisdom of a nation should apply itself to reform the system.

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