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VISUAL MAGIC with LIQUIDS
Show four clear transparent tumblers in four different sizes.
Each tumbler is twice the size of the previous one.
The smallest tumbler is filled with milk.
You pour the contents of this smallest tumbler into the next size up tumbler, which is twice its size.
MAGICALLY the milk DOUBLED filling the entire tumbler!
You repeat this process with the other two tumblers, DOUBLING the milk again and again!
Perform the effect in REVERSE as well!