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The magician shows two empty paper bags and has them inspected.
He then shows that in his right hand he is holding a plastic sheet with
a card printed on it, while in his left he is holding a transparent
plastic sheet.
The magician now “dips” the sheets each, in one of the bags
for only a fraction of a second. Incredibly when he pulls them out they
are seen to have changed places.
The effect can be immediately repeated making the plastic sheets instantly
switch back again… just an illusion, or pure magic?