Holograms are defined as interfering waves and tend to create a photographic three-dimensional effect that varies according to the angle of light. They are obtained thanks to the holography technique : a set of grooves are carved onto a cliché by a laser beam, this cliché  gives rise to micro-facets on the paper that allow the light to be reflected according to the angle of light. Coloured or multi-coloured, two-dimensional or three-dimensional images or drawings may be obtained. Holograms may be made in continuous bands or as individual patches applied to paper in the following phase of paper production by means of heat transfer.