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Well, it's actually your subconscious mind that's doing the work. You wouldn't want to consciously direct your hand back and forth, but rather visualize, and your hand will automatically begin to move. Although, it's hard to tell that this is happening—it seems as if some strange telekinesis power were moving the object, but I don't think that's the case.
However, it does show how (unconsciously) we can do things by a mere thought. I think of those times when I'm driving, perhaps talking on the phone at the same time, having driven all the way to my destination without even noticing it! Pretty amazing what the subconscious mind can do, not to mention how perfectly it seems to do the work.
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