A Disappearing/Reappearing Coin
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When you close the box fully, the coin either disappears or reappears.
Contributed by: Jon Perry (March 2011)
Open content licensed under CC BY-NC-SA
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"A Disappearing/Reappearing Coin"
http://demonstrations.wolfram.com/ADisappearingReappearingCoin/
Wolfram Demonstrations Project
Published: March 7 2011