Its quite alright, I probably didn't explain it well. I had the luck of learning all this in a physics class, and an awesome teacher to explain it all. Far as I'm aware of in Science Fiction, holograms have always required a point of origin, be it a compact disc or display of some type.
The basic way of creating a hologram is to use a coherent beam of light, a beam splitter to separate said beam into an "illumination beam" that will strike the object to be recreated (forming an 'object beam') and a reference beam, which strikes a properly placed mirror to bounce towards a photographic plate. The Object beam and reference beam both hit the plate, and "record" the object onto it. Its actually closer to recording audio, than taking a picture of something.
http://upload.wikimedia.org/wikipedia/commons/3/34/Holography-record.png
Because the object is recorded on that plate, if you break the plate in half, each plate will have the full recording. You can continue breaking it apart, but eventually the quality will degrade to a point that it's useless. All you need to see it, is to look at it, as the material its put upon is enough to project it.
Interesting tidbit, is that we have already created a form of media storage using just holograms. They created a 120mm disc that can hold almost 4 Terabytes, with 1gig writing speeds and possibly up to 1 Terabyte reading speeds.
Other uses for it can be found on wiki:
http://en.wikipedia.org/wiki/Hologram