holography, means of creating a unique photographic image without the use of a lens. ... An ordinary photographic image records the variations in intensity of light reflected from an object, producing dark areas where less light is reflected and light areas where more light is reflected.

1. Holography principal
• The holographic principle is a property of quantum gravity theories which
resolves the black hole information paradox within string theory. First
proposed by Gerard 't Hooft, it was given a precise string-theory
interpretation by Leonard Susskind.
• A hologram is a physical structure that uses light diffraction to make an
image; the image can appear to be three-dimensional. Holography is the
science and the practice of making holograms. Typically, a hologram is a
photographic recording of a light field, rather than image formed by lens.
• Principal of holography is as that it is based on the principle of
interference. A hologram captures the interference pattern between two or
more beams of coherent light i.e ( laser light ). One beam is shone directly
on the recording medium and act as a reference to be light scattered from
illuminated scene.

3. Holography is a photographic technique
• That records the light scattered from an object, and then present in a
way that appears three-dimensional. Hologram pop up in movies in
movies such as “Star wars” and “ Iron man” but the technology has not
quite caught up to movie magic — yet.
• Various types of holograms have been made over the years, including
transmission holograms, which allow light to be shined through them
and the image to be viewed from the side; and rainbow holograms,
which are used for security purposes — on credit cards and driver's
licenses, for example.

5. Hologram exist
• According to Hacked, the technology behind touchable holograms has
been existence for a number of years now but has been nowhere
near capable of being introduced to the commercial market because
the laser beams, which generate the hologram, actually burn human
skin on contact with it.