You will need: Three identical Glasses.
To balance the glasses, one on top of the other, on their outer rims.
People will find this impossible without the knowledge of the '10 and 2 o'clock secret.
Place the bottom glass (A) on the table and looking from above, imagine a clock around the top of the rim. Now balance the middle glass B at approximately 10 o'clock. Now imagine another clock dial on the second glass (B) and balance the top glass (C) at approximately 2 o'clock.
With some patience this trick can be done in one swift movement by balancing glasses B and C simultaneously.
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