Holography How do holograms work
Table of Contents
- Criticism and Outlook
A hologram is a three-dimensional image produced using holographic techniques that has a physical presence in real space, or a recording that reproduces a three-dimensional image. The term holography is used to summarize processes that use the wave character of light to achieve a realistic representation. In this context, interference and coherence play an important role. Colloquially, certain three-dimensional projections are also referred to as holograms. There are many different types such as image plane holograms, reflection holograms, multiplex holograms, and computer generated holograms.
Well-known applications are product presentations. The holograms are created in pyramid-shaped attachments or with special equipment and are used to catch the eye at trade fairs and in shop windows. Scientific and technical implementations are also relevant. The representations on concert stages are usually not holograms in the narrower sense, but projections on glass panes or transparent curtains. A Japanese company has developed the "Gatebox" with a holographic anime figure that has natural language skills, is connected to artificial intelligence and is intended to serve as a partner and assistant.
In "Star Wars", Leia delivers a message, projected onto a table by R2-D2. In "Star Trek" William Riker moves in virtual landscapes of the holodeck, in "Ghost in the Shell" fish made of light swim through the air next to Major, in "Blade Runner 2049" Officer K lives with a holographic companion named Joi and meets holographic dancers and (long deceased) singers. Science fiction films are teeming with fictional holograms. The last-mentioned work sets milestones, for example with the merging of Joi with a replicant into a third woman.
Criticism and Outlook
Science fiction films in particular have raised high expectations that have not yet been met. The fictional holograms have an enormous effect. Even the real ones, despite their inadequacies, attract the viewer and leave him amazed. This is mainly due to the mentioned physical presence in real space, which is not given with virtual reality. The further development of the holograms would give the mentioned areas new impulses. Technology and information ethics address the relationships we enter into with holograms, business and especially business ethics the substitution of products and people and the suggestive and manipulative effects at the point of sale.
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