This
manifesto is presented, unedited in its original form.
It was distributed locally at public forums and to various
individuals around the country in 1972. It was sent to
Leonardo, International Journal of the Contemporary Artist
in 1973 and was accepted byEditor, Roger Malina for publication.
Working with Mr. Malina, the text was edited and rewritten
to conform with Leonardo Journal standards.The manifesto
was re titled and published: Leonardo, Vol. 7. No.
2 Spring, 1974, Pergamon Press, “On Stereoscopic Painting”
pages 97 – 104. Roger Ferragallo, 7/12/2000
(Reformatted for Web Display)
A MANIFESTO
DIRECTED TO THE NEW AESTHETICS
OF STEREO SPACE IN THE VISUAL
ARTS AND THE ART OF PAINTING
November 12, 1972
© Roger Ferragallo
Painting is reborn…….Enter
the new awareness of Stereo Space and a New Aesthetics …….The
centuries long conquest of plastic forms within a monoscopic
pictorial space is ended……..A new era lies ahead for the visual
arts…….The living third dimensional space-field awaits its
birth. It asks nothing more than the trance-like stare
of the middle eye to invoke Cyclops to waken from his 35,000
year sleep. This primeval giants reward will be the
sudden revelation and witness to the dematerialization of
the picture surface into an aesthetics of pure space where
visible forms will materialize and release themselves—forms
that are suspended, floating, hovering, poised, driving backward
and forward, near enough to touch and far enough away to escape
into the void………...So now enter a new aesthetic empathy, meditation,
subjective intensity and an unparalleled form-space generation
and communication.
All of this exciting
injunction could have been declared 134 years ago had it not
been for the invention of photography. But at
that time, 1838, the full investigation of form within the
limits of the monoscopic surface had not yet been fully realized:
the genius of Cezanne, Picasso, Braque, Duchamp, Balla, Mondrian,
Kandinsky, Moholy-Nagy, Pollach and Escher lay ahead.
Awaiting the future, too, would be the subjection of the picture
plane to the forces of sculpture with such explosive consequences
that our galleries and museums are graveyard and garden of
plastic visual forms rented from the ribs of paintings.
Looking back to 1838, one gazes with astonishment at the paper
presented to the philosophical Transactions of the Royal Society
of London on June 21, 1838 by Charles Wheatstone. Entitled
“ON SOME REMARKABLE AND HITHERTO UNOBSERVED, PHENOMENA OF
BINOCULAR OF BINOCULAR VISION”, this paper must now
be recognized as describing one of the most remarkable techno-visual
discoveries in the 35,000 years of the History of Art.
This paper revealed a discovery as stunning as were the great
polychrome visions painted by Magdalenian artists.
Its contents were as innovative as was the first portrayal
of overlapping planes and depth by the great neolithic cultures.
It’s thesis was a powerful as the conquest of the third dimension
rendered by Greek and Pompeian painters as focused in the
Villa of Mysteries—yes, as revolutionary as was Brunelleshi’s
invention of the laws of perspective and Campin’s and Van
Eyck’s development of the oil medium in the early hours of
the 15th century—even as momentous for our twentieth
century as were the shattered and re-combined forms of the
Cubists and the pioneers who explored “simultaneity”, psychic
symbolism and free association. (1)

Fig. 1
Returning to 1838, to Wheatstones stereoscopic drawings
in the light of what was to boil out of Paris and London by
Turner, Constable, Delacroix, Corot, Daguerre, Plateau, and
to the oncoming tide of Courbet Manet, Monet, Seurat and Cezanne,
one can be stirred by the lonely singular event portrayed
in the stereoscopic drawing of two cubes by Wheatstone (Fig.1).
If it meant little at the time to artists, too shocked by
Daguerres “sun-pictures” and Talbot’s “The Pencil of Nature”,
it now means the eclipse of our monoscopic view of the picture
surface as a staging arena for plastic form and the beginning
of a new space aesthetics of air, light, form, color—all discharged
into the openness of windowless space.
Now awakened from
its long sleep, the discovery by Wheatstone of the psycho-optical
consequences of our binocular vision of reality, one sees
that this is but the product of our two spaced-out eyes rendering
two different retinal views of forms in the visual field.
Two views, however, brought into a cyclopean fusion by the
mind to render a profound single spatial awareness of reality—as
reality is. Aware of this phenomenal rendering, Wheatstone
wrote:
“It will now
be obvious why it is impossible for the artist to give a faithful
representation of any near solid object, that is, to produce
a painting which shall not be distinguished in the mind from
the object itself. When the painting and the object
are seen with both eyes, in the case of the painting two similar
pictures are projected on the retinae, in the case of the
solid object the pictures are dissimilar; there
is therefore an essential difference between the impressions
on the organs of sensation in the two cases, and consequently
between the perceptions formed in the mind; the painting therefore
cannot be confounded with the solid object.” (2)
Despite this remarkable
achievement and prescience of Wheatstone, all of the progress
and innovative developments of painters to his time (and yes,
ours) to arrive at “a painting which shall not be distinguished
in the mind from the object itself”—all were doomed to
failure in spite of the incredible monoscopic illusionist
successes of Van Eyck, Raphael, Heda, Zurbaran and Harnett.
It
remained for Wheatstone to make the singular discovery that
when we view a cube which is set before us and when we close
one eye and then the other, it is apparent that we see two
distinctly different appearances of the cube. While
corroborations of this fact can be traced back through illustrious
writings of Francis Agullonius, Baptista Porta, Leonardo Di
Vinci, and even more into the remote past—to Galen and Euclid,
it remained for Wheatstone to produce the first stereo- synthetic
form and the means to achieve a conscious stereopsis of it
in the mind. It must have been an extraordinary
moment of insight when he realized that when two outline drawings
representing the binocular view of a cube might become fused
together, then this image would be accepted by the mind as
a concrete solid existing in the same real spatial sense—as
though one could reach out to touch it. Indeed
this was the case. Wheatstone devised a simple mirrored
apparatus to aid the cause of fusing his three-dimensional
drawings. He called this device a Stereoscope
(Fig.2). Wheatstone does not appear to discuss, at any
length, the direct vision viewing of stereo pairs, nor does
he suggest that he has delivered to the visual arts a new
revolutionary method. He speaks to this, however, in
these words:
“For the purposes of illustration
I have employed only outline figures for had higher shading
or coloring been introduced it might be supposed that the
effect was wholly or in part due to these circumstances,
whereas by leaving them out of consideration no room is
left to doubt that the entire effect of relief is owing
to the simultaneous perception of the two monocular projections,
one on each retina.. But if it be required to obtain
the most faithful resemblances of real objects, shadowing
and coloring may properly be employed to heighten the effects.
Careful attention would enable an artist to draw and paint
the two component pictures, so as to present to the mind
of the observer, in the resultant perception, perfect identity
with the object represented. Flowers, crystals, busts,
vases, instruments of various kinds, etc., might thus be
represented so as not to be distinguished by sight from
the real objects themselves” (2) (Fig. 3).
Were it not
for the invention of the photograph these words might
have fired the new spatial art. One might imagine
where this revolutionary concept would have taken
Manet, Monet, Seurat or Cezanne. Within six
months of delivering his paper to the Royal Society,
Wheatstone had already conceived of asking Fox Talbot
and Henry Collen to provide him with photographic
Talbotypes of statues, buildings and people.
Since then photography has continued to utilize this
astonishing discovery.
Fig. 3 |
 |
We must return
back to the moment before the photographic stereo view of
reality overwhelmed Wheatstone and his contemporaries.
A mere seven score years is but a moment in the strata of
history—but the soil is now ready. Today we are dealing
with the possibilities that entire orchestrations of color
forms can be made to exist synthetically in a binocular
space-field that is itself consonant with reality. The
phenomenon of the Cyclopean Eye which miraculously renders
our visions of the pristine, sylvan landscape now prepares
us for the new stereoscopic art. Oliver Wendell Holmes,
speaking in the year 1859, (Atlantic Monthly) might as well
have directed these words to us when he wrote:
“Nothing but
the vision of a Laputan, who passed his days in extracting
sunbeams out of cucumbers, could have reached such a height
of delirium as to rave about the time when a man should paint
his miniature by looking at a blank tablet, and a multitudinous
wilderness of forest foliage or an endless Babel of roofs
and spires stamp itself, in a moment, so faithfully and so
minutely, that one may creep over the surface of the picture
with his microscope and find every leaf perfect, or read the
letters of distant signs….just as he would sweep the real
view with a spyglass to explore all that it contains.” (3)
Though Holmes was
referring here to the art of stereo-photography, this augury
is but a stone's throw to an art of pigment, dye and ink.
When the art of stereo-drawing and binocular disparity is
mastered, one is within reach of a totally new aesthetics;
an art of undetermined power—radically different, and basically
new, whose only requirement will involve a capacity at everyone’s
disposal who has normal binocular vision—the converging
of lines of sight.
This will require some examination
of our binocular powers of vision. Two distinctly
different projections of outside environments, falling upon
the active retinal screens of both eyes cause the unexplainable,
as yet hidden, power of consciousness to form a coherent,
corespondent synthesis of the outside environment.
When we fix our eyes, in a relaxed manner, upon the most
distant reaches of a landscape, both eyes, are said to be
staring with parallel lines of sight. (Fig. 4)
Each eye, under these circumstances, is rendering its own
different view of what might be a line of mountains.
We may say that in the “mind’s eye” the images of the mountains
have coalesced—fused into one image; as though we had an
eye in the middle of our foreheads. In a sense,
metaphorically, we have; we will refer to this as the cyclopean
eye. (Hering, “oeil de cyclope imaginaire,” 1867)
Vision is mainly,
however, concerned with convergence. Now as we look
with both our eyes at specific objects located within the
binocular field, from six inches to as far as we can see,
we are rotating our eyes to converge two lines of sight
upon an object. Our eyes can accommodate to focus and
converge upon any form, anywhere in the visual field, with
fixed attention, or with saccadic strokes. A single
eye can do just as well, in the sense that the visual field
is formed by the eye into a great cone of space—like a giant
cyclone light flux 150 degrees wide. The eye of the
cyclone, at its apex corresponds to the fovea of the retina
which is the seat of our sharpest vision. One has a
view of it by imagining a fine pencil of laser light emerging
from the vanishing point of some self-directed linear perspective.
All of the visual cues available to painters today to suggest
distance and depth are entirely the domain of the single eye.
But when both of these great visual cones converge upon an
object in space—a profound property of vision emerges:
stereopsis. Two retinal screens, not one, signal
the cascading light show from outside the lens window of the
eye to the cyclopean eye which opens to consciousness a psychic
field consonant with the binocular field. (Fig. 4)
The more conscious we are of the
spatial distinctions within the vastness of this fused,
binocular-psychic space, the richer it can be said is our
“stereopsis”. The key to our sensation of stereopsis
is through two well known factors acting together:
Convergence and Disparity. (4)

Fig. 4
When both retinal cones converge
upon a specific object in space, the eyes have found the
range, so to speak, and the mind computes an accurate sense
of distance. Binocular convergence involves the fact
that our eyes are separated by a width of about 2 ½
inches. With this width serving as a base, our two
lines of sight converge upon specific objects in space,
spraying a profusion of triangular fixations upon them.
With each fixation, a train of focal adjustments for each
eye lens issues simultaneously as the eyes fix upon a distant
aircraft, a nearby tree, or an ant passing over a leaf.
The brain gives a critical evaluation of both factors and
computes its sense of definition, distance and scale.
Acting in concert with triangulation and focal accommodation
is the brains computation of the shifted differences observed
in objects that are seen separately by the left and right
eye. This is called binocular or retinal disparity.
(Parallax-displacement-shift) It is absolutely
critical and important to our sensation of depth perception.
Fig. 5, No.1 to 5
By examining Fig. 5, No. 1 to
5, one can easily ascertain the fact that we see everything
double except for the area around the foveal point of convergence
of the primary lines of sight. Unconsciously, we simply
pay little attention to this double vision unless we make
a point to observe it as indicated by the diagrams.
The mind however, compares and regards this rain of light
bombarding the retina, with all its subtended angles and
shifts of position, with computed finesse. Disparity
as we shall see, will be at the center of the new space
aesthetics.
Connected with convergence
and disparity, and important to this thesis, will be the
realization that just as one has the ability to converge
upon these words, any one can just as easily acquire the
skill of crossing the visual axes in an imaginary space.
(5) This essential factor, combined with disparity,
opens the way to learning the methods and skills in both
the construction of primary binocular forms and the viewing
of them. The illustration in Fig. 5, No. 6 suggests
that a left and right line of sight can be
brought to cross
in space at an imaginary point (cv) to fuse two objects
(A & B), at a distance, into one. This imaginary
point is obtained by fixing the lines of sight at about
reading distance, usually by staring ahead (obtaining a
fix) through the index finger. Obtaining such a “fix”
upon the tip of the index finger will cause any pair of
objects in the distance, two balls for example lying along
the same path of sight, to coalesce into one new ball at
the center position. The two original balls remain
in sight, as two residual-phantom images. This can
all be very easily demonstrated another way by using only
the fingers. Simply raise the forefinger and

Fig. 5, No. 6
middle finger of one hand into
the familiar V sign, at arms length. Bring the tip
of the finger of the opposite hand between the eyes at about
reading distance and stare ahead. By closing one eye
and then the other, one can corroborate precisely what is
illustrated in Fig. 5, No. 6.

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As a further
consequence of this discussion of disparity and convergence
it will help to look at Fig. 6 which illustrates the
two distinctly different methods of viewing binocular
constructions. The method of parallel lines
of sight (staring fixedly ahead beyond the pairs)
and the method of crossing lines of sight are
contrasted. Viewing stereo constructions by means
of parallel sight limits picture size (2 ½” separation
between image objects) which is a physical limitation
based upon the interocular separation of the eyes.
This special kind of vision, then, limits itself to
small scale pictures and figures. |
An interesting example of the early use of this idea, published
in 1860, is the advertisement shown in Fig. 8. This
example serves to demonstrate the arrangement of words as
merely decorative as distinguished from the expressive-spatial
interrelationship found in 3-D Concrete Poetry. (6)
Fig. 8
It is the crossing of lines of sight that must
draw our full attention. This is of great importance
because there is no limit to the size of images and
constructions; nor is there a limit to the distance
from which they may be viewed. Crossing lines of
sight is central to the proposal in this thesis.
It must be noted that both of these methods (parallel
and cross vision) of viewing stereo constructions have
quite different properties. This difference will
be apparent as you try to view the constructions in Fig.
6. You will note an inversion of the spatial figures
if you use one and then the other method of viewing the
small figures. The large stereo drawing at the top
of the page is impossible to view with parallel sight
because the homologous points are beyond 2 ½ inches.
With crossed vision they present no problem. Accomodating
yourself to crossing your lines of sight brings the viewer
to within reach of the new space art—an art whose only
requirement will involve the necessity of staring fixedly
at the center point between the dyptich images of a stereographic
construction. (Fig. 7) There will be the essence
of hypnosis in the stare, for it will project one into
space to interlock with the painted color forms until
he is no longer outside but virtually inside—in aesthetic
empathy with whatever visual forces have been unleashed
into the openness of space. The act of seeing this
new space is simple: You, the viewer, may use a
finger as a reference to crossing your lines of sight,
or you may block out the left and right images with your
hands; or use the suggested cardboard block-out
card shown in Fig. 7.

Fig. 7
You stare—you
willfully converge your eyes at your finger tip and at
the same time observe the dual construction ahead as it
divides into three images. It is at this instant
that you stare at the third central image—you gaze—concentrate—meditate
fixedly upon the center image until it comes on
you—and it will—with the clarity and power of sudden revelation.
The painted forms will be seen to exist in real space,
actually and concretely, as if in the nether world of
dreams you have just opened a middle eye—a cyclopean power.
Oliver Wendell Holmes, writing in Atlantic Monthly, July,
1861, in an article titled: “Sun-Painting and Sun Sculpture”
speaks of this faculty:
“Perhaps there
is also some half-magnetic effect in the fixing of the eyes
on the twin pictures, --something like Mr. Braid’s hypnotism……At
least the shutting out of surrounding objects, and the concentration
of the whole attention, which is a consequence of this, produce
a dream-like exaltation of the faculties, a kind of clairvoyance
in which we seem to leave the body behind us and sail away
into one strange scene after another like disembodies spirits.”(7)
When you will have
once raised the lid of the middle eye—the cyclopean power
will remain open and becomes easier—finally effortless.
You will have before you a visual field of immense spatial
depth, an arena where the total of the visual vocabulary will
be given the distinction of reality and life in space.
A powerful intensification of communication—of communion with
form. Elements which formerly were locked within the
monocular field are now free to exist above, within, and beyond
the surface upon which the forms themselves are painted.
There are no longer any barriers to position or place in stereo
space—no boundaries. Any diptych pair can be paired with
any other to render a sense of boundless repetition in
all directions. (Fig. 9 and Fig.10) With the simple
act of cyclopean fusion even the very walls of architecture
will dissolve away into immense stereo spatial fields of crystalographic
color patterns. The physical carrier of form, be it
canvas, paper, concrete, fresco will no longer have any meaning.
Dot, Line, Plane, Volume, Space, Color and Texture will orchestrate
in open space where formerly the dynamics of such spatial
entities were displayed in concert with the surface.
In the new aesthetics of stereo-space the surface dematerializes
and evaporates itself into space. It is quite remarkable
that this dematerialization of the picture surface was described
in some detail by Sir David Brewster in his book “On the Stereoscope”
published in 1856. In a Chapter titled: “On the
Union of Similar Pictures in Binocular Vision”, he describes
experiments on large surfaces that he covered with similar
plane figures. Brewster stated:
“If we, therefore, look at a papered wall without
pictures, or doors, or windows, or even at a considerable
portion of a wall, at the distance of three feet and unite
two of the figures, two flowers, for example—at the distance
of twelve inches from each other horizontally, the whole
wall or visible portion of it will appear covered with flowers
as before but as each flower is now composed of two flowers
united at the point of convergence of the optic axes,
the whole papered wall with all
its flowers will be seen suspended in the air at the distance
of six inches from the observer! At first the
observer does not decide upon the distance of the suspended
wall from himself. It generally advances slowly to
its new position, and when it has taken its place it has
a very singular character. The surface of it seems
slightly curved. It has a silvery transparent aspect.
It is more beautiful than the real paper, which is no
longer seen, and it moves with the slightest motion
of the head. If the observer, who is now three feet
from the wall, retires from it, the suspended wall of flowers
will follow him, moving farther and farther from the real
wall, and also, but very slightly farther and farther from
the observer. When he stands still, he may stretch
out his hand and place it on the other side of the suspended
wall, and even hold a candle on the other side of it to
satisfy himself that the ghost of the wall stands between
the candle and himself.”

It seems
impossible that these words should lie buried for 116 years.
And it is even more astounding that this marvelous description
by Brewster could possibly have been and still can be an art
involving repeated patterns, continuous friezes, whole architectural
assemblages of crystalographic color-forms suspended in air,
existing beyond and beneath a dematerialized planar surface.
Buried in the 19 Century, and clearly within the scope of
this statement—of the new aesthetics, also lie experiments
by Brewster, H. W. Dove, and O. N. Rood on what they called
the theory of “Lustre”. This involves the binocular
fusion of color fields giving rise
to phenomenological kinds of atmospheric, optical color mixture.
The monocular color fields of Seurat and color field abstractionists
today will pale before the new possibilities of binocular
color fusion. Returning to Brewster, one cannot underestimate
the enormous possibilities suggested by him. Not only
is he saying that the surface has dematerialized, but that
stereoscopically paired graphic forms can be multiplied
n-times-in all directions. In Fig. 10, one of Wheatstone’s
paired drawings has been organized as a potentially n-crystalographic
field—either by the method of parallel sight or by cross-viewing,
you will immediately witness something very astonishing:
One will find that his “Cyclopean” sense, the unconscious,
(Gestalt) or whatever it will eventually be understood
to be, will hold the entire field fixated while at the
same time, he (the viewer) is free to direct his eyes to any
portion of the field—to focally converge upon any particular
isolated point, figure or cluster of figures. How
does the mind hold so large a psychic field of visible forms
constant while permitting a foveal examination of details
in any direction? It is as though one has induced hypnosis
to one level of mind while permitting another level of mind
virtual license.
One will
find, too, that the more he exercises this psycho-optic ability,
the easier and easier it becomes to fixate both the field
and its detail. After a time, it will seem quite natural
to cross-view synthetic forms as it is natural to converge
the eyes normally upon objects. This suggest the vista
of an aesthetics that will undoubtedly bring forth a very
powerful (psychosynthesis) transcendental, meditative art.
This binocular art may also have within it the power to bridge
the gulf between the traditional Western and Eastern conceptions
of space. Here, then, will be an aesthetics that will
involve the philosophical, historical, spatial invention of
both East and West into an unparalleled new synthesis.
The picture surface has only been understood, up to now, monoscopically,
as though we were all inhabitants of some “Flatland” (9).
This is not to say that the great tradition of monoscopic
painting is to be occluded any more than it is to view the
techno-spatial inventions of the last 35,000 years are suddenly
brushed aside. Monoscopic, flat field, or space-illusionist
art whether it be Paleolithic, Medieval, or of the nature
of “The Garden of Delights”, Michelangelo’s “Sistine Ceiling”,
“La Grand Jatte”, “Guernica”; all of these are
among the treasured heritage of the past. The long history
of hard-won innovations of rendering visual illusions upon
planar surfaces is an immense fund of techno-visual language.
From the Aurignacian to the present, the list of spatial invention
is long: vertical position, overlapping planes, diminution
of size, aerial and linear perspective, inverted and multiple
perspective, foreshortening, shadows, texture gradients, optical
illusions, interpenetrating form and space, advancing and
receding color fields, two dimensional space division, illusions
of motion and after images. A stereo art cannot properly
exist without the involvement of these important monoscopic
space illusions. What is called for now is the re-integration
of this knowledge with our psycho-binocular powers of stereopsis—a
sensing of the three-dimensional space field that lies both
within and without us. This is both possible now and
necessary. Speaking both to the art of pigment, dye
and ink and to the art of light sensitive emulsions—inevitably
they must now be driven together. Stereoscopic aesthetics
will be an arena that will see the plastic forms of the past
100 years fusing into staggering arrays of re-combinations
of familiar and unfamiliar forms, new synthesis, shimmering-lustrous
color fields; all existing in air—a space without a
canvas base, paper base or physical carrier whatever.
There will be complete and remarkable deceptions of the physical
and mental eye. The space outside our heads will match
the space inside our minds. It will mean the discovery
of a mental force that will warp two constructions into one—into
single a cyclopean phantom, as though our primitive, infantile
diplopia were being brought into fusion and synthesis.
We are at the beginning of a new era in the visual arts no
less momentous than was our thrust into the depths of space,
which was to link the surface of the earth with the Lunar
Sea of Tranquility. We looked back upon ourselves from
that luminous Astral sea with psychic shock and a compelling
awareness of where we really are. No less are we enthralled
by the vastness of inner-space. We can truly be aware
that this intensification between ourselves, this planet “space-ship
earth” coupled with our relentless bombardment of atomic nuclei
will all inevitably drive the arts (as we know them) into
totally new perspectives. The time is now. The
tools are here: they exist in the photographic arena
of Holography, Xography, Vectographs, Anaglyphs, polarized
stereo pairs, wide screen stereo-panoramas, stereo-cinematography
and stereo-video. They are before those of us who must
now awaken the sleeping cyclops to reform – and to refashion
in paints, dyes and inks, synthetic assemblage orchestrations
of color-forms in a psychic-binocular space.
© Roger Ferragallo 1972
REFERENCES
1.
Wheatstone, Charles. Philosophical Transactions
of the Royal Society of London,
“On
Some Remarkable and Hitherto Unobserved Phenomena of Binocular
Vision,”
June
21, 1838
2. Ibid.,
page 376
3. Holmes,
Oliver Wendell. “The Stereoscope and the Stereograph”,
Atlantic Monthly,
June,
1859, pages 738-739
4.
Julesz, Bela “Foundations of Cyclopean Perception”, Univ.
Chicago Press, 1971
5.
Krause, E.E., Reading in 3-D, Research and Development,
Nov. 1972, pages 38-40
6.
Layer, H.A., Space Language: Three Dimensional Concrete
Poetry, Media and Methods,
January
1972
7.
Holmes, Oliver Wendell, “Sun Painting and Sun Sculpture,”
Atlantic Monthly, July 1861 pages 14-15
8.
Brewster, D., The Stereoscope; It’s History, Theory and
Construction with its Application to the Fine and Useful
Arts and to Education, London: John Murray, 1856,
Chapter VI, page 91
9
Layer, H.A., Exploring Stereo Images: A changing awareness
of space in the fine arts, Leonardo 4 233, 1971
ILLUSTRATIONS
Fig.
1 Stereoscope-Wheatstone, 1838
Fig.
3 Wheatstone – Original page of Stereo Constructions,
1838
Fig.
4 Convergence of Lines of Sight
Fig.
5 Analysis of the Binocular Disparity Field and Stereopsis
Fig.
6 Parallel Lines of Sight -- Crossed Lines of Sight
Fig.
7 Methods – Theory
Fig.
8 Stereoscopic Advertisement, 1860
Fig.10
N-Crystalographic Field of Wheatstone’s Line Figures
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