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{{Other uses|Eyebeam (disambiguation){{!}}Eyebeam}}
{{Other uses|Eyebeam (disambiguation){{!}}Eyebeam}}
In the [[physics]] inherited from [[Aristotle]] an '''eye beam''' generated in the [[Human eye|eye]] was thought to be responsible for the [[Visual perception|sense of sight]]. The eye-beam darted by the imagined [[basilisk]], for instance, was the agent of its lethal power, given the technical term ''extramission''.
In the [[physics]] inherited from [[Plato]]<ref>Plato, ''Timaeus'' 45.</ref> (although rejected by [[Aristotle]]<ref>Aristotle understood sight correctly, as depending on light: ''On Sense and the Sensible'' 1.3; ''On the Soul'' 418b-419a.</ref>), an '''eye beam''' generated in the [[Human eye|eye]] was thought to be responsible for the [[Visual perception|sense of sight]]. The eye beam darted by the imagined [[basilisk]], for instance, was the agent of its lethal power, given the technical term ''[[Emission theory (vision)|extramission]]''. {{cn|date=January 2017}}
[[File:Rome-Capitole-StatueConstantin.jpg|thumb|upright|The colossal head of [[Constantine I|Constantine the Great]] ([[Capitoline Museums]])]] Notice the wide eyed surprise on his face. He assumed this expression when he discovered his wife cheating with a Centurion.
[[File:Rome-Capitole-StatueConstantin.jpg|thumb|upright=0.7|The colossal head of [[Constantine I|Constantine the Great]] ([[Capitoline Museums]])]]
The exaggerated eyes of fourth-century [[Roman emperor]]s like [[Constantine I|Constantine the Great]] (''illustration'') reflect this character.<ref>L. Safran, "What Constantine saw: reflections on the Capitoline Colossus, visuality and early Christian studies" ''Millennium 3''' (2006:43-73), noted in Paul Stephenson, ''Constantine, Roman Emperor, Christian Victor'', 2010: notes 333.</ref> The concept found expression in poetry into the 17th century, most famously in [[John Donne]]'s poem "The Extasie." Later in the century [[Isaac Newton|Newtonian optics]] and increased understanding of the structure of the eye rendered the old concept invalid, but it was revived as an aspect of monstrous superhuman capabilities in [[popular culture]] of the 20th century.
The exaggerated eyes of fourth-century [[Roman emperor]]s like [[Constantine I|Constantine the Great]] (''illustration'') reflect this character.<ref>L. Safran, "What Constantine saw: reflections on the Capitoline Colossus, visuality and early Christian studies" ''Millennium 3''' (2006:43-73), noted in Paul Stephenson, ''Constantine, Roman Emperor, Christian Victor'', 2010: notes 333.</ref> The concept found expression in poetry into the 17th century, most famously in [[John Donne]]'s poem "The Extasie":
<blockquote><poem>
Our eye-beams twisted, and did thred
Our eyes, upon one double string;
So to'entergraft our hands, as yet
Was all the meanes to make us one,
And pictures in our eyes to get
Was all our propagation.
</poem></blockquote>

In the same period [[John Milton]] wrote, of having gone blind, "When I consider how my light is spent", meaning that he had lost the capacity to generate eye beams.

Later in the century, [[Isaac Newton|Newtonian optics]] and increased understanding of the structure of the eye rendered the old concept invalid, but it was revived as an aspect of monstrous superhuman capabilities in [[popular culture]] of the 20th century.


The '''emission theory of sight''' seemed to be corroborated by [[geometry]] and was reinforced by [[Robert Grosseteste]].<ref>B.S. Eastwood, "Mediaeval Empiricism: The Case of Grosseteste's Optics" ''Speculum: A Journal of Mediaeval Studies'', 1968.</ref>
The '''emission theory of sight''' seemed to be corroborated by [[geometry]] and was reinforced by [[Robert Grosseteste]].<ref>B.S. Eastwood, "Mediaeval Empiricism: The Case of Grosseteste's Optics" ''Speculum: A Journal of Mediaeval Studies'', 1968.</ref>


In [[Algernon Swinburne]]'s "Atalanta in Calydon" the conception is revived for poetic purposes, enriching the poem's pagan context in the Huntsman's invocation of [[Artemis]]:
In [[Algernon Swinburne]]'s "Atalanta in Calydon" the conception is revived for poetic purposes, enriching the poem's pagan context in the Huntsman's invocation of [[Artemis]]:
<blockquote>Hear now and help, and lift no violent hand,<br>
<blockquote><poem>Hear now and help, and lift no violent hand,
But favourable and fair as thine eye's beam,<br>
But favourable and fair as thine eye's beam,
Hidden and shown in heaven".</blockquote>
Hidden and shown in heaven".</poem></blockquote>


In [[T.S. Eliot]]'s rose garden episode that introduces "[[Four Quartets|Burnt Norton]]" eyebeams persist in the fusion of possible pasts and presents like unheard music:
In [[T. S. Eliot]]'s rose garden episode that introduces "[[Burnt Norton]]" eyebeams persist in the fusion of possible pasts and presents like unheard music:
<blockquote>The unheard music hidden in the shrubbery<br>
<blockquote><poem>The unheard music hidden in the shrubbery
And the unseen eyebeam crossed, for the roses<br>
And the unseen eyebeam crossed, for the roses
Had the look of flowers that are looked at.<br>
Had the look of flowers that are looked at.
</blockquote>
</poem></blockquote>


The New Zealand poet [[Edward Tregear]] instanced "the lurid eye-beam of the angry Bull"— [[Taurus (constellation)|Taurus]] of the zodiac— among the familiar stars above the alien wilderness of New Zealand.<ref>Quoted in K. R. Howe, "The Dating of Edward Tregear's 'Te Whetu Plains', and an Unpublished Companion Poem" ''Journal of New Zealand Literature'' '''5''' (1987:55-60) p. 58.</ref>
The New Zealand poet [[Edward Tregear]] instanced "the lurid eye-beam of the angry Bull"— [[Taurus (constellation)|Taurus]] of the zodiac— among the familiar stars above the alien wilderness of New Zealand.<ref>Quoted in K. R. Howe, "The Dating of Edward Tregear's 'Te Whetu Plains', and an Unpublished Companion Poem" ''Journal of New Zealand Literature'' '''5''' (1987:55-60) p. 58.</ref>


In [[computer graphics]], the concept of eye beams is fruitfully resurrected in [[Ray tracing (graphics)|ray tracing]] (in which the bouncing of eye beams around a scene is simulated computationally).
In [[computer graphics]], the concept of eye beams is resurrected in [[ray casting]] in which the bouncing of rays of light cast from a viewpoint around a scene is simulated computationally.<ref>{{cite web |title=What is ray casting? |url=https://www.adobe.com/products/substance3d/discover/what-is-ray-casting.html |publisher=Adobe |access-date=13 December 2024}}</ref>


==See also==
==See also==
[[Emission theory (vision)]]
*[[Emission theory (vision)]]


==Notes==
==Notes==
{{reflist}}
{{reflist}}


[[Category:Obsolete scientific theories]]
[[Category:Obsolete theories in physics]]
[[Category:Vision]]
[[Category:Vision]]

Latest revision as of 20:10, 13 December 2024

For other uses, see Eyebeam.

In the physics inherited from Plato[1] (although rejected by Aristotle[2]), an eye beam generated in the eye was thought to be responsible for the sense of sight. The eye beam darted by the imagined basilisk, for instance, was the agent of its lethal power, given the technical term extramission. [citation needed]

The colossal head of Constantine the Great (Capitoline Museums)

The exaggerated eyes of fourth-century Roman emperors like Constantine the Great (illustration) reflect this character.[3] The concept found expression in poetry into the 17th century, most famously in John Donne's poem "The Extasie":

Our eye-beams twisted, and did thred
Our eyes, upon one double string;
So to'entergraft our hands, as yet
Was all the meanes to make us one,
And pictures in our eyes to get
Was all our propagation.

In the same period John Milton wrote, of having gone blind, "When I consider how my light is spent", meaning that he had lost the capacity to generate eye beams.

Later in the century, Newtonian optics and increased understanding of the structure of the eye rendered the old concept invalid, but it was revived as an aspect of monstrous superhuman capabilities in popular culture of the 20th century.

The emission theory of sight seemed to be corroborated by geometry and was reinforced by Robert Grosseteste.[4]

In Algernon Swinburne's "Atalanta in Calydon" the conception is revived for poetic purposes, enriching the poem's pagan context in the Huntsman's invocation of Artemis:

Hear now and help, and lift no violent hand,
But favourable and fair as thine eye's beam,
Hidden and shown in heaven".

In T. S. Eliot's rose garden episode that introduces "Burnt Norton" eyebeams persist in the fusion of possible pasts and presents like unheard music:

The unheard music hidden in the shrubbery
And the unseen eyebeam crossed, for the roses
Had the look of flowers that are looked at.

The New Zealand poet Edward Tregear instanced "the lurid eye-beam of the angry Bull"— Taurus of the zodiac— among the familiar stars above the alien wilderness of New Zealand.[5]

In computer graphics, the concept of eye beams is resurrected in ray casting in which the bouncing of rays of light cast from a viewpoint around a scene is simulated computationally.[6]

See also

[edit]

Notes

[edit]
  1. ^ Plato, Timaeus 45.
  2. ^ Aristotle understood sight correctly, as depending on light: On Sense and the Sensible 1.3; On the Soul 418b-419a.
  3. ^ L. Safran, "What Constantine saw: reflections on the Capitoline Colossus, visuality and early Christian studies" Millennium 3' (2006:43-73), noted in Paul Stephenson, Constantine, Roman Emperor, Christian Victor, 2010: notes 333.
  4. ^ B.S. Eastwood, "Mediaeval Empiricism: The Case of Grosseteste's Optics" Speculum: A Journal of Mediaeval Studies, 1968.
  5. ^ Quoted in K. R. Howe, "The Dating of Edward Tregear's 'Te Whetu Plains', and an Unpublished Companion Poem" Journal of New Zealand Literature 5 (1987:55-60) p. 58.
  6. ^ "What is ray casting?". Adobe. Retrieved 13 December 2024.
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