A google search will bring up a lot of pages talking about cutting a hologram in halve and ending up with two smaller copies of the original hologram. What about the reverse? I can't find anything which says what happens when you stick the two pieces together again. Will you end up with two copies of the hologram side by side? Or will they merge into the original hologram? If they do not merge, why is that? If they do, at what point does the image become one? What would one see if they did this with both copies illuminated?