Transmision hologram table, c 1990s.
© Science Museum / Science & Society Picture Library
This table set up with holography apparatus shows the path a laser beam takes when a holographic image is created. Transmision holograms are created by splitting a laser beam into two. One beams shines directly onto a photographic plate, whilst the other reflects off the object onto the plate. There, the beams combine again to form a pattern containing information about the three-dimensional image of the object. It can be viewed by illuminating the developed plate with laser light.