Strange stuff:
“Every part of a hologram contains the image of the whole object. You can cut off the corner of a hologram and see the entire image through it. For every viewing angle you see the image in a different perspective, as you would a real object. Each piece of a hologram contains a particular perspective of the image, but it includes the entire object.”
I don’t get it. You cut a photo in half, you have half a photo. But you cut a hologram in half, and you get two full images. Weird. 
Well with hologram, you get 3D image. If you slice 3D image in 1/2, you still get full picture except that it’s sliced in 1/2. You see what’s inside of it.
If you slice a picture in half, it becomes half because it is just a 2D image.
Prehaps I made that mmm clearer? Or even more confusing? 
the (2d) ‘film’ is actually all the waves combined together, and since waves can exist at the same spot at once without losing or influencing themselves, every part contains the whole. although the more you splice, the less quality you get.
I got all that from the book I read long ago, The Holographic Universe.
just to be. more confusing.
When you look at a hologram you are not seeing one image, but 100s at slightly different angles - this is what creates the 3D illusion.
Pilot, that book sounds interesting! May have to check it out.
"Today nearly everyone is familiar with holograms, three-dimensional images projected into space with the aid of a laser. Now, two of the world’s most eminent thinkers – University of London physicists David Bohm, a former protege of Einstein’s and one of the world’s most respected quantum physicists, and Stanford neurophysiologist Karl Pribram, one of the architects of our modern understanding of the brain – believe that the universe itself may be a giant hologram, quite literally a kind of image or construct created, at least in part, by the human mind. This remarkable new way of looking at the universe explains now only many of the unsolved puzzles of physics, but also such mysterious occurrences as telepathy, out-of-body and near death experiences, “lucid” dreams, and even religious and mystical experiences such as feelings of cosmic unity and miraculous healings. "