Just because the duplicate has continuity of consciousness doesn’t make him the exact same person.
One Danton throws the switch. That Danton is either transported or stays where he is. At that time, a duplicate of Danton is created in the opposite location.
And our armchair philosophy department will argue that these two men are exactly the same at that moment, because to say otherwise means you’re arguing for the existence of a soul, harrumph harrumph, et cetera.
No, there’s at least one other important physical difference - and that’s location, location, location. One of the two Dantons did not physically exist the moment before the switch was thrown. They possess molecules in identical configurations, but they do not share the same molecules. One of them has just come into being, created out of the ether.
And our armchair philosophy department will make reference to distinctions without difference.
But let us say I had a disk of information. I put it in my CD-ROM drive, D:. I start a program to copy that information to a second, blank CD-ROM (of the same manufacture) in E:. The process completes. Now, which disk is the original? They’re physically identical. The contain the same information. Surely, then, the question is one of the great imponderables of the universe!
Not really. The original disk is in D:. The copy’s in E:. They may be identical and interchangeable in most senses, but one of them only became that way recently, and thus, the word ‘original’ is useful to use because it helps us describe the process.
Further, we’re only assuming the copies are identical in The Prestige. We don’t really examine the question at length. If we allow that it’s **possible **that the copy is somehow lesser, then it becomes essential that we distinguish the original.