And compared to the cinematography of Auguste and Louis Lumière which brings since 1895 to two initial dimensions of photography (height, width) the fourth dimension (time) for a motionless observer, holography brings well to these two dimensions photography, the third dimension (depth) and the fourth dimension for an observer moving !

At the beginning of cinematography, the spectators had the impression that only one photography became animated, without becoming aware of the succession of photographs because of the persistence of the luminous impressions on the retina preventing the eye from seeing the blacks separating each motionless test.
In addition, it is sometimes impossible for us for lack of reference mark to distinguish as spectators if, like in the case of the apparent movement of the sun, it is the camera which turned around the fixed object at the time of the catch of sights, or the object which turned on itself in front of the fixed camera.
And before even the existence of the French patent of February 13 1895 of the brothers Lumière entitled “apparatus being used for obtaining and the vision of the chronophotographic tests” allowing this animation of photographic images for a motionless spectator, the chronophotographic tests of Etienne Jules Marey brought already a vision animated to an observer moving which can traverse several of these images in one second…

The vision around an object fixes in 3 dimensions is done well in space and time. And for a good appreciation of this new name, one should not focus its attention on 3 dimensions of the object represented, but on the space-time vision which this image in 4 dimensions gets, as an image and not an object, having well an additional dimension compared to an image in 3 dimensions not allowing any exploratory movement of the observer !
In fact, the error was to consider that an image in 4 dimensions could only be one stereoscopic image animated with a fixed support and a motionless observer !..

Image in 4 dimensions of an animated object
for a motionless observer

(instructions for the vision of the relief simulated without special glasses)
Subject : armillaire sphere established according to the planetary model of the astronomer and Greek geographer Ptolémée of Alexandria (90-168) which remained until XVIe century, where the sun turns around the ground which remains motionless in the center of the universe…

How it is by a displacement by translation of only one holographic support or by an exploratory movement of the observer, the vision offered by a holographic image to great angle of vision is space-time, with a perfect continuity of the evolution of the relief, which justifies the name of image in 4 dimensions, with in more like characteristic to be written completely instantaneously on only one negative !
And as Gabriel Lippmann in 1908 at the French Company of Photography as regards integral photographs expressed it : “ it could appear incredible a priori that only one and even photographic test can show us a succession of different sights ”.

Image in 4 dimensions of a fixed object
for an observer moving


The hologram (H, for top) has a format equivalent to one of the plane sights of the armillaire sphere. However, the observer this time moving around the holographic image of an object fixes, can for example see at the time of its exploratory movement of position 1 with position 4, the equivalent of the preceding image of an object animated for a motionless observer realized starting from the four stereoscopic couples above.

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