If it was faked using magnetic pulses from under the table, the little magnet pusher on the bottom would probably move from the pulses. Or else the pulses would have to be perfectly timed when the pusher moves.
Of course as already pointed out, compressed air could have been used.
The only way to know for sure is to build it.
Of course as already pointed out, compressed air could have been used.
The only way to know for sure is to build it.
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