I have before me a rock. I say that it is my rock because I designed it. I have designed it, in fact, to appear in all respects as a natural rock. Go out and find a rock and you will have a decent example of how my rock might look, feel, smell, sound, and, for you freaky people, taste.
Now, if I took my rock and mixed it in with 99 rocks gathered at random from nature, how would you determine which one is my rock?
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