Image in 4 dimensions
impossible to see by television or Internet

Initially, each one must become aware that it evolves in the space-time, although the enigma of this last, reserved for the field of fundamental scientific research, would be with the borders of the universe…
Albert Einstein wrote in 1936 with Léopold Infeld in a work entitled “the evolution of the ideas in physics” (Flammarion) the two following remarks :
“Indeed, they are not two, but four numbers which should be employed to describe the events in nature. Our physical space, such as it is conceived by means of the objects and their movements, has three dimensions, and the positions are characterized by three numbers. The moment of an event is characterized by the fourth number. Four definite numbers correspond to each event; a definite event corresponds to four numbers. Thus: the world of the events forms a four-dimensional continuum. There are nothing mysterious in all that. (...) The world of the events can be described dynamically by an image which changes the time and which is projected on the background of space with three dimensions. But it can be also described by a static image which is projected on the background of the four-dimensional space-time continuum. ”
It is it should be noted that Albert Einstein (1879-1955) was not likely unfortunately to see a hologram as of the appearance of the lasers at the beginning of the Sixties. It is perhaps one of the reasons for which a holographic image of a fixed object remained until the end of the XXe century only to the row of an image “in 3 dimensions”, like the image of an old stereoscope of the XIXe century for the binocular vision of a motionless observer !
Whereas this traditional designation of any holographic image of an object fixes according to only the three dimensions of geometrical space is not enough to explain the space-time vision which it gets for an observer moving !

By definition, a dimension is a extent susceptible for measurement.
In holography, the extent of a field of vision of 180 degrees around an image does not concern that only one image fixes in 2 dimensions (height and width), but a succession of images in 2 dimensions in which it is enough to only one image by the accommodation of the eye, or for more precision, of two images in binocular vision, to allow the observer to measure the depth of the relief (the 3rd dimension).
This extent made up of a succession of images in 2 dimensions can be measured by the observer by one the 4th dimension, time, giving him the duration of the apparent evolution of the relief coming from a displacement of the holographic support or its own exploratory movement.
Therefore, a holographic image which restores instantaneously all the images in 2 dimensions taken around a fixed object in 3 dimensions, is more than one image in 3 dimensions, but already an image in 4 dimensions which offers to observers moving, a vision in space and time as in reality around the object.

In encyclopedic data of 2001 (Hachette Multimédia / Hachette Livre), the definition concerning dimensions of a holographic image remained the following one:
“… Contrary to an ordinary photograph, a hologram returns the dimension of depth and can recreate the parallax (apparent change of prospect which occurs when an object is seen under various angles)….Each point of the hologram received information from the object in its entirety, which has two consequences: first of all, part of the hologram is enough to restore the image of the object in its entirety; then, owing to the fact that each point of the hologram sees the object under a different angle, the restored image is really three-dimensional… ”.

With this apparent change of prospect for the image of a fixed object, like the apparent movement of the sun with the ground revolving on itself, this concept of parallax borrowed from the field of astronomy, can in fact of actually appreciating itself like the expression of the fourth dimension of time relating to the exploratory movement of the observer, to see evolving the relief of a fixed object starting from one only holographic image.
Although time belongs here only to the displacement of the observer, one should not therefore especially reducing to a simple image in three dimensions this holographic fixed image which offers to the observer a perfect vision in space and time, when the hologram is carried out directly starting from an object in 3 dimensions without photographs or intermediate synthesized images !

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