Dennis Gabor invented 'holography,' a method of
displaying a three-dimensional image of an object by splitting
a coherent light beam so that some of it falls on a photographic
plate and the rest on the object which reflects back onto the
photographic plate. The two beams form an interference pattern
on the plate with alternating light and dark. "The
light is where the two images both relect light back and reinforce
each other, while the dark is where the images do not match".
The plate is then developed, creating a 'hologram,' Greek for
'completely written.'