How does a magic crystal ball work?

Answer 1

A crystal ball is used in the practise of scrying (a form of divination). Objects such as the crystal ball, water, fire, clouds, tea leaves, coffee grains, and many more can be used as the focus of the diviner's attempt to receive information about an issue, fortell the future, or discover hidden knowledge.

Crystals in particular are good for scrying as they are amplifiers, and transmitters and receivers of energy. They work by providing a focus for the reader's subconscious, which he can then tap into in order to uncover hidden knowledge.

If nothing else, crystal balls are a great meditation aide :)

Answer 2

Here's the thing: They don't work

______

Alternative answer: Crystal balls act as a channel for the user's subconscious. They have no power of their own, but in terms of allowing one to open up and tap into their foresight, they are second to none. Part of a centuries old tradition known as "Scrying", they are a fascinating subject to both explore and practise.