A Vanishing Area Puzzle Made of Chocolate

Here's a neat trick that might come in handy this Halloween. It's possible to remove a bit of chocolate from a chocolate bar and, if done correctly, nobody will be any the wiser.

This type of optical illusion is called a vanishing area puzzle (or paradox).

The following video illustrates the principle, courtesy of self-proclaimed "Wonder Injector" Mariano Tomatis.




(via Boing Boing)